- In a distant galaxy, a race of humans called the Alterans experience a fundamental split in cultural governance. The majority push for a religious focus, while a smaller group push for a scientific one. Fearing extreme persecution, the small Alteran group choose against using technology which could brainwash their brothers and depart in a ship for a galaxy to call their own. The scientific Alterans will henceforth be known as Ancients. ("Avalon, Part 2;" "The Fourth Horseman, Part 1;" The Ark of Truth)
- The Ancient Amelius begins to develop Stargate technology. (The Ark of Truth)
- The Ancients come upon the Local Group and make the Milky Way Galaxy their home. They seed numerous worlds with Stargates as well as human life, and settle on a planet they name "Terra." ("Avalon, Part 2")
- The religious-based Alterans will eventually ascend and be known as the Ori, establishing the Origin religion and creating planets full of worshipers to feed their need for energy.
3-50 MILLION YEARS AGO
- The Ancients form an alliance with three other races in the galaxy including the Asgard, Nox and Furlings. They establish a meeting planet on Heliopolis as a sort of galactic "United Nations." ("The Torment of Tantalus")
- Proclarush Taonas is abandoned by the Ancients. ("The Pegasus Project")
- A terrible plague cripples the peoples of the Milky Way. ("Window of Opportunity," et al)
- The Ancients of P4X-639 engineer a time machine to go back before the plague to reverse it, but discover the flawed technology only goes backwards by 10 hours. They eventually deactivate the device and accept their fate. ("Window of Opportunity")
- The Ancients create a device on Dakara to repair the damage caused by the plague. ("Threads")
- The Ancients of Earth abandon their interests in the Milky Way and set course for the nearby Pegasus Galaxy in Atlantis. Ayiana, a carrier of the plague, is left behind. ("Rising")
- The Dakara device activates to relaunch the Milky Way's evolution process. (Conjecture in relation to other events)
- The Ancients arrive in the Pegasus Galaxy. As before, they create a network of Stargates and seed life on numerous planets. Atlantis makes its home on Lantea. ("Rising")
- The Ancients establish a network of defense satellites in the Lantean system. ("The Defiant One")
HUNDREDS OF THOUSANDS OF YEARS AGO
- The Ancients dispatch the Destiny into the far reaches of the universe to discover a signal they have located buried in the fabric of space-time since the dawn of creation. ("Air, Part 2")
CA. 100,000 YEARS AGO
CA. 30,000 YEARS AGO
- A crew of Asgard depart their planet in suspended animation. At this stage in their development they are still capable of sexual reproduction. ("Revelations")
CA. 15,000 YEARS AGO
CA. 11,000 YEARS AGO
- The Altairan (not to be confused with the Ancients) Hubbald establishes an underground complex on Altair to take the place of the planet's failing biosphere. ("Tin Man")
MORE THAN 10,000 YEARS AGO
- Iratus bugs sample human blood and evolve into Wraith.
- The Wraith construct ships and weapons to feed their hunger for human life essence.
- The Ancients engage the Wraith in battle. Though they are superior in technology, the Wraith are superior in number. A 100-year war ensues. ("Before I Sleep")
- The Ancients construct the Replicators, but eventually abandon the project and bomb Asuras. The Replicators begin to rebuild their civilization. ("Progeny")
10,000 YEARS AGO (8000 BC)
- Ra arrives on Earth via mothership and takes a host from the North African desert. He proceeds to collect samples of humans from across the planet to spread among the stars as slaves. ("Stargate" the Movie)
- The Ancient warship Aurora is sent to the outer rim of the Pegasus Galaxy to gather information concerning a weakness in Wraith defenses. Life support fails before they can return to Atlantis with the information they have obtained. The crew survive in stasis pods. ("Aurora")
- An Ancient entrusts the Quindosim with a Zero Point Module. The Quindosim would eventually be culled by the Wraith. ("The Brotherhood")
- Chaya Sar ascends and takes on the guise of Athar, protector of Proculus. She lashes out with her ascended powers against the Wraith. Ascended beings in the Pegasus Galaxy punish her by forcing her to protect Proculus for all time. ("Sanctuary")
- The Ancients forfeit the 100-year war. They recall their forces to Atlantis for a final stand and create a window Ancient refugees to return. Numerous ships reach the Lantean system but are destroyed. ("Before I Sleep")
- John Sheppard, Radek Zelenka and Elizabeth Weir, having narrowly escaped a catastrophic power failure in a future Atlantis, unwittingly trigger a time jump in a Puddle Jumper to this time period. After a fatal crash, Weir is the only survivor, recovered by the Ancients. ("Before I Sleep")
- Having lost the war with the Wraith, the Ancients sink Atlantis deep beneath the Lantean oceans. Janus, the inventor of the time-traveling Puddle Jumper, disobeys the orders of the Council and leaves Elizabeth Weir in the city. She slumbers for 10,000 years, waking at intervals to regulate the power systems so that she may avert Atlantis's future power failure. ("Before I Sleep")
- Realizing they have missed the evacuation of Atlantis, the crew of the Ancient warship Tria set a course for the Milky Way at light speed. ("The Return, Part 1")
- The Lantean survivors, now on Earth, attempt to avoid influencing the primitive tribes of man. Moros, Ganos Lal, and numerous other Ancients seclude themselves and learn to ascend while the rest die out. ("The Pegasus Project")
6,700 YEARS AGO (4700 BC)
- Elizabeth Weir is revived from stasis in Atlantis to rotate the city's Zero Point Modules. ("Before I Sleep")
5,000 YEARS AGO (3000 BC)
- Ishkur's elite force of Jaffa commanders rebel against him. He orders their deaths, but they flee in search of Kheb. The traitors find a secluded planet and become the Sodan. ("Babylon")
- SG-1 travels back in time and unwittingly participates in the uprising of Ancient Egypt, driving Ra from the planet. The rebels secretly bury the Stargate at Giza so that it may be found in the future. SG-1's presence in the past is hidden from history. ("Moebius, Part 2")
- After a human rebellion Ra loses interest in Earth. To prevent another uprising, he removes the written word from Abydonian culture. ("Stargate" the Movie)
CA. 4,000 YEARS AGO (2000 BC)
- Omaroca journeys to Earth to free humans from the Goa'uld. She is discovered by Belos and is killed. Nem begins his search for her. ("Fire and Water")
3,400 YEARS AGO (1400 BC)
- Elizabeth Weir is briefly revived from stasis in Atlantis to rotate the city's Zero Point Modules. ("Before I Sleep")
CA. 3,000 YEARS AGO (1000 BC)
- The Goa'uld Thanos experiments with the volatile element naquadria, nearly destroying the planet which will one day be called Langara. ("Fallout")
CA. 2,000 YEARS AGO (0 BC/AD)
- Hathor is imprisoned within a Mayan temple on Earth. ("Hathor")
- Bedrosia/Optrica is afflicted with severe earthquakes, and the Stargate becomes buried. This period will be remembered as the Upheaval. ("New Ground")
- Egeria breaks from the Goa'uld and creates the first spawning cycle of Tok'ra. Ra imprisons her on Pangar. ("Upgrades;" "Cure")
- Across the universe, a terrible miscalculation sends the Destiny crew, minus Nicholas Rush and David Telford, back in time to this period. The countries of Novus and Futura are born on an Earth-like planet, and will evolve into a technologically advanced society. ("Common Descent;" "Epilogue")
- In his alternate timeline, Dale Volker dies of kidney failure. Tamara Johansen dies of Lou Gherig's Disease. (Alternate timeline)
- Sensing the growing threat of the Ori, Moros abandons ascension to retake human form. Now known as Myrddin, he establishes an enclave of noblemen including Arthur and the Knights of the Round Table. During this period Myrddin is the most powerful human being on the planet. Ganos Lal is ordered by the other ascended beings to retake human form and monitor him. She takes on the name of Morgan Le Fay. ("The Quest, Part 2")
- Myrddin creates phase-shifting technology to secretly develop a weapon capable of destroying ascended beings. Realizing his intention to one day destroy the Ori, Morgan destroys the device and hides Myrddin in an isolated Stargate network. ("Arthur's Mantle," "The Quest, Part 2")
- The Goa'uld return to Earth, destroy Teotihuacan and depart again with many of its people. They will later be known as the Orbanians. ("Learning Curve")
- The inhabitants of P7J-989 advance their technology too rapidly. A chemical disaster renders the planet uninhabitable. Several citizens are placed in suspended animation within a bio-dome, their minds kept active by computer. ("The Gamekeeper")
- Sokar visits Earth and captures a colony of medieval Christians. ("Demons")
- The alien race of PXY-887 end the oppression of the Goa'uld on their planet and take the guise of Spirits to live in harmony with the transplanted Salish tribe. ("Spirits")
- Anubis is banished by the Goa'uld System Lords. Though they believe him to be dead, he departs for Kheb. There, the ascended Oma Desala teaches him to ascend. The ascended collective witnesses Anubis's treachery and attempts to push him back to the mortal plane, but only succeeds halfway. Anubis departs the Milky Way Galaxy with the Ancient knowledge he has learned. Oma is punished for her actions. ("Last Stand;" "Threads")
- The Asgard lose their ability to sexually reproduce, and adopt a "quick-fix" with cloning technologies. Genetic degradation is inevitable. ("Revelations")
- Medrona is terraformed by an alien species. The Touchstone is installed to maintain ideal weather conditions. ("Touchstone")
- The last of several massive Wraith cullings occur in the Pegasus Galaxy, and will be come to be known as the great holocaust. ("Rising, Part 1")
- The people of M7G-677 institute a policy of suicide at the age of 25, which they believe keeps the Wraith away. ("Childhood's End")
- The Latonans construct the Sentinel. ("The Sentinel")
- Apophis defeats Shaq'ran. ("Cure")
- The Goa'uld depart Tagrea. The citizens, who had endured great hardships, only now begin to record their history. ("Memento")
- Seth establishes a cult of worshipers near Stonehenge. ("Seth")
- Saroosh blends with Selmak. ("The Tok'ra, Part 2")
- Ma'chello is born. ("Holiday")
- The Novans discover a cure for Lou Gherig's Disease. ("Epilogue")
- The Tok'ra Jolinar and Martouf become involved. ("The Tok'ra, Part 1")
- Haikon becomes leader of the Sodan. ("Babylon")
- Teal'c is born to Ro'nac. ("The Light")
- An ancient Goa'uld temple, Egeria's prison, is unburied on Pangar. ("Cure")
- Cameron Mitchell is sent back in time from 2008 to stop the Goa'uld System Lord Baal from changing the course of history in 10 years. (Stargate: Continuum)
- The Stuart Expedition fails. Numerous crates, including one carrying the canopic jars of Osiris and Isis, sink with the shipwreck. ("The Curse")
- The Stargate is ferried across the Atlantic Ocean aboard the steamship Achilles. Baal's plan to travel back in time and alter history is thwarted by Cameron Mitchell. (Stargate: Continuum)
- President Franklin Roosevelt suspects the Stargate to be a weapon and orders Dr. Langford to take advantage of the device for use against the Germans. The Stargate opens to the planet Heliopolis. Ernest Littlefield is sent to investigate and is trapped on the other side when the gate disconnects. ("The Torment of Tantalus")
- The Orbanians begin to experiment with nanotechnology. ("Learning Curve")
- Egeria begins to be used in Pangaran medical experiments. ("Cure")
- A solar flare sends SG-1 into the past. The team is taken into custody by the Air Force. George Hammond recognizes a note in his handwriting and frees the team. Before they go, he notices a scar on Samantha Carter's hand. With help from Catherine Langford and the future Hammond, SG-1 uses the Stargate and return to their time. ("1969")
- Adam Brody is born. ("Darkness")
- Moloc decrees that only male Jaffa under his domain will be allowed to live. Ishta, the record-keeper of births, begins to formulate the Hak'tyl resistance with Mala and Neith. ("Birthright")
- Groups of Novans branch out into their galaxy to colonize other worlds when it is apparent that the geology of their planet is coming undone.
- Jack O'Neill and Charles Kawalsky serve together in a black-ops mission to recover a Russian agent in East Germany. ("The Gamekeeper")
- Eli Wallace is born to Maryann Wallace. ("Darkness")
- The Asgard ban Loki from experimenting on humans from Earth. ("Fragile Balance")
- Samantha Carter serves in the Persian Gulf War. There, she logs more than 100 hours in enemy air space. ("Children of the Gods")
- Jack O'Neill serves with Harlan Beck at Incirlik Air Force Base, Turkey, for Operation Proven Force. ("Fragile Balance")
- The Stromos crashes on P2A-347. ("Lifeboat")
- The Stargate is moved from Creek Mountain to the Cheyenne Mountain Complex. (Conjecture)
- Samantha Carter joins Catherine Langford in developing a computer designed to interpret data pulses generated by the Stargate. After a period of trial and error they are able to unlock the gate's inner track and connect six chevrons. ("Children of the Gods")
- The Tok'ra incite a rebellion on a world occupied by Qetesh. When her Jaffa are eliminated, Qetesh is tortured and beaten by the people. The Tok'ra eventually rescue her and remove the Goa'uld from the host body -- Vala Mal Doran. ("Prometheus Unbound")
CA. 1996 ("Stargate" the Movie)
NOTE: That the film's events take place two years later than its theatrical release is established by the 1-year gap prior to "Children of the Gods" and Carter's statement that "Out of Mind" takes place in the year 1999. (This assumes that roughly one season of the TV show equals one year of time.)
- Charlie O'Neill dies of a gunshot wound.
- Daniel Jackson is hired by Catherine Langford to interpret the Stargate's glyphs, as well as the seventh symbol.
- The Stargate is successfully opened to the planet Abydos.
- Jack O'Neill leads a team to Abydos to assess any threats to Earth, and if necessary, use a nuclear device to destroy everything on the other side.
- Sha're is betrothed to Daniel Jackson.
- Ra is killed and the oppressed Abydonian civilization is freed.
- Jack and Sarah O'Neill divorce. Jack gives up smoking.
CA. 1997-98 (SG-1 Season One)
- Apophis searches the galaxy for new Goa'uld hosts, including one for his queen. He travels to Earth with his forces, unintentionally reactivating Cheyenne Mountain Complex to assess his threat.
- Apophis travels to Abydos and steals Sha're and Skaara.
- Daniel Jackson orders that the Abydos Stargate be buried for exactly one Abydonian year after he departs.
- Stargate Command and Sierra Golf teams 1 through 9 are formed.
- Sha're and Skaara become unwilling hosts to the Goa'uld Amonet and Klorel, respectively.
- Teal'c betrays Apophis and is branded "shol'vah," paving the way for an outright Jaffa rebellion.
- SG-1 makes contact with the Nox.
- Daniel Jackson destroys Thor's Hammer on Cimmeria in order to free Teal'c from the Asgard anti-Goa'uld technology.
- SG-1 is sent to Heliopolis with Catherine Langford to rescue Ernest Littlefield. There, they discover the ancient meeting place of the four great races, as well as knowledge of their existence.
- Teal'c fails in preventing his son Rya'c from receiving his first prim'tah. He is forced to leave his son and wife, Drey'auc, on Chulak to fend for themselves.
- Nem, still searching for Omaroca, captures Daniel Jackson. Daniel recalls memories of a passage of text which reveal that Belos killed her.
- Hathor is released from her Mayan prison and escapes through the Stargate.
- Nirrti wipes out all the inhabitants of Hanka to prevent Stargate Command from discovering her hok'taur experiments. Cassandra, the lone survivor, is sent back to Earth as a trojan horse. Her explosive breaks down inside her body instead. Janet Fraiser adopts Cassandra.
- SG-1 rescues the last evacuation team of Tollan officers. Persecuted by the N.I.D., the Tollan join the Nox. Both parties eventually find a way to send the survivors to their people's new home world, Tollana.
- The Antarctic Stargate is discovered.
- The last survivor of Altair, Harlan, creates SG-1 duplicates to help him maintain Hubbald's underground complex.
- Senator Robert Kinsey cuts funding to Stargate Command.
- Daniel Jackson, having received a warning from an alternate reality (as well as a gate address to a Goa'uld stronghold), convinces the rest of SG-1 to stop the threat. They emerge aboard Klorel's mothership, en route to destroy Earth.
- SG-1 and Bra'tac neutralize Apophis and Klorel's motherships.
- Funding to Stargate Command is reinstated.
CA. 1998-99 (SG-1 Season Two)
- Scientists at Area 51 recover two Goa'uld death gliders and begin to retrofit them for the X-301.
- Samantha Carter is forcibly blended with Jolinar, who is on the run from a Goa'uld ashrak. Jolinar expends all of her energy to preserve Carter's life.
- SG-1 is sentenced by the Taldur to life imprisonment in Hadante. The team works with Linea to leave the prison world. Once out Linea, called "Destroyer of Worlds," escapes.
- With Thor's Hammer destroyed, Heru'ur takes Cimmeria for himself. Daniel Jackson breaks the natural cycle of Cimmerian development for the people and reveals the Asgard -- their gods -- prematurely. Thor arrives in the Asgard mothership Beliskner to wipe out Heru'ur's forces. But Heru'ur himself escapes.
- The P5C-353 Orb is brought back to Earth, where it is opened. Stargate Command agrees to deposit the Orb on P4G-881.
- Apophis takes Rya'c as his pupil. Teal'c receives word and returns to Chulak to rescue his son.
- One Abydonian year to the day, Daniel returns to Abydos and finds Sha're with her father. She is pregnant, and the Goa'uld Amonet is sleeping so that the child will not emerge stillborn.
- Jacob Carter informs his daughter Samantha that he has lymphoma and a terminal diagnosis.
- Shifu, the son of Apophis and Amonet, is born. Heru'ur travels to Abydos to steal him, but Daniel Jackson hides the baby among the Abydonians and makes Amonet think Heru'ur was successful. Apophis, hoping to meet his newborn son, leaves only with Amonet.
- SG-1 meets the Tok'ra and establishes a tentative alliance.
- Selmak, in need of a new host, blends with Jacob Carter and becomes Earth's envoy. Saroosh, Selmak's previous host, dies.
- SG-1 tampers with the natural balance between the Salish and their Spirits, forcing the spirits to reveal their true nature.
- Rogue N.I.D. agents remove the Touchstone from Medrona, plunging the planet into an ice age. SG-1 retrieves the device and returns it to the Medronans before the damage is permanent.
- Jack O'Neill accidentally downloads the entire database of the Ancient repository of knowledge into his mind. The information in his brain allows him to install numerous new Stargate addresses, not known to the Goa'uld, into the dialing computer. O'Neill sends himself to the Ida Galaxy where the Asgard remove the knowledge.
- A black hole causes P3W-451 to succumb to a time dilation field, trapping SG-10 on the planet.
- Apophis pleas with SG-1 to protect him from Sokar. He dies of his injuries at Stargate Command. Teal'c sends his body through the Stargate to the waiting hands of Sokar, who reanimates Apophis to repeatedly torture him to death.
- Ma'chello tricks Daniel Jackson into transferring bodies. He leaves the base for Colorado Springs, but the authorities soon capture him. Ma'chello is forced to return to his original body, where he dies.
- George Hammond notices the same wound on Samantha Carter's hand, and realizes the time has come to write the note to his younger self. After an adventure in 1969 and the distant future, SG-1 returns to their proper time.
- Hathor captures SG-1 and stages an elaborate hoax to gain what information they have about the current Goa'uld domain. A Tok'ra agent helps free the team. O'Neill pushes Hathor into a cryogenic soup, killing her.
CA. 1999-00 (SG-1 Season Three)
- Seth is killed by Samantha Carter.
- Samantha Carter is promoted to the rank of Major.
- The Asgard mediate with the Goa'uld System Lords on Earth and place the planet under the Protected Planets Treaty.
- Nirrti is banished by the System Lords and becomes a renegade.
- The Orbanians share naquadah reactor technology with Earth.
- Amonet/Sha're is killed by Teal'c.
- Linea is identified in the body of Ke'ra.
- Apophis is branded Na'onak and becomes First Prime to Bynarr, ruler of Ne'tu. Apophis slays Bynarr to gain access to the imprisoned SG-1.
- Sokar is killed. Apophis takes his armies for himself.
- Klorel/Skaara is recovered by the Tollan people. Humans, Goa'uld and Nox mediate over which entity will take ownership of Skaara's body. The Nox rule in favor of Skaara. Klorel is extracted and sent to a Goa'uld planet of his choice.
- Harry Maybourne's off-world rogue N.I.D. operation is halted by Jack O'Neill. Maybourne flees to Siberia.
- The Bedrosians excavate their Stargate.
- Daniel Jackson discovers Kheb and the location of Shifu. The ascended Oma Desala stops an attack by Apophis and flees with the baby to another world.
- Replicators travel to Earth aboard Thor's ship. SG-1 destroys the vessel. One Replicator survives and infests a Russian submarine. The sub is destroyed, and the U.S. military conceals the incident from the Russians.
CA. 2000-01 (SG-1 Season Four)
- The Russians recover the Egyptian Stargate from the bottom of the Pacific Ocean and soon establish their own Stargate program in Siberia.
- A Russian team is sent to P2X-338 to recover the Eye of Tiamat.
- The Rogue N.I.D. begin to experiment with combining human DNA with that of the Goa'uld Sekhmet. ("Resurrection")
- Shau'nac is killed by Tanith. Teal'c vows to avenge her death.
- Martouf is killed by Samantha Carter. The Tok'ra symbiote Lantash survives in stasis.
- Stargate Command begins to transfer Enkaran refugees to a new home world.
- SG-1 is sent to Siberia to deactivate their Stargate and investigate the Russians' failed program.
- Harry Maybourne is captured in Siberia and imprisoned.
- Daniel Jackson establishes peaceful relations with an Unas tribe on P3X-888.
- The Enkarans are flown to their original homeworld in a Gadmeer terraformer.
- The X-301 is deemed a failure.
- Artifacts from the Stuart Expedition are excavated from the ocean floor and sent to the University of Chicago.
- Osiris is released from its canopic jar by Sarah Gardner, who is taken as its new host. She kills David Jordan and flees Earth in a hidden ship.
- Heru'ur captures Teal'c and offers him as a gift of good faith to Apophis for forming an alliance. Apophis falls for a Tok'ra ruse and destroys Heru'ur, absorbing his fleet. Teal'c escapes with the converted Jaffa, Rak'nor.
- George Hammond resigns from Stargate Command. General Bauer takes his place. Jack O'Neill works with Harry Maybourne to uncover Senator Kinsey's involvement and force Hammond to be reinstated.
- Robert Kinsey announces his plan to run for President of the United States.
- A message from a future Jack O'Neill warns never to travel to P4C-970. Hammond orders the address blocked out of the dialing computer.
- SG-1's Altairan duplicates invent power packs and use the Stargate to go on missions. They travel to Juna and are confronted by Cronus. Harlan pleas for the assistance of the original SG-1. Cronus is killed, and all of SG-1's clone duplicates lose power and die.
- SG-1 and the Tok'ra detonate Vorash's sun, destroying most of Apophis's fleet.
CA. 2001-02 (SG-1 Season Five)
- Apophis dies (again), this time at the hands of the Replicators and a ship crashing into the planet Delmak.
- The ascended being Orlin is forgiven of his wrongdoing and allowed to rejoin the ascended collective.
- SG-1 encounters the Reole and gains access to their chameleon-like chemical.
- Cassandra comes of age and her physiology begins to mutate. Nirrti arrives at Stargate Command to continue her hok'taur experiments. She is discovered and is set free in exchange for saving Cassandra's life.
- The Unas Chaka is captured by Burrock's people. Daniel Jackson and SG-1 manage to free the Unas, but the creatures take the fight back to the villagers.
- SG-1 and a Russian unit investigate the missing team from P2X-338. Marduk retakes a human host. He and the Eye of Tiamat are buried in rubble from a C4 explosion.
- The Tollan Curia form an alliance with Tanith, an envoy of Anubis, to prevent their annihilation, and agree to develop phase-shifting weapons of mass destruction. The Tollan Narim takes matters into his own hands and destroys the manufacturing plant. Anubis's forces destroy the Tollan civilization from orbit.
- SG-1 forms a tentative alliance with the Aschen. When it is discovered that their home world may be P4C-970, Hammond orders the team to investigate further. The Aschen's plan to absorb Earth into their confederation and make humans extinct is thwarted.
- Adrian Conrad is implanted with a Goa'uld. Frank Simmons kidnaps him as a future bargaining chip for the Rogue N.I.D..
- Tanith is killed by Teal'c.
- Anubis reveals his return to the System Lords who (minus Yu) vote him back into their ranks in exchange for destroying Earth. Osiris holds his seat on the council.
- Lantash and Lt. Elliot die.
- Jonas Quinn smuggles naquadria to Earth.
- Daniel Jackson ascends with the help of Oma Desala.
- Thor's consciousness is downloaded into Osiris' mothership. His clone body lapses into a coma.
CA. 2002-03 (SG-1 Season Six)
- The X-302 interceptor is completed.
- Teal'c's wife Drey'auc dies.
- Naquadria-based hyperspace technology is deemed a failure.
- Anubis destroys the Antarctic Stargate, but fails in destroying Earth.
- Jonas Quinn joins SG-1.
- Thor's consciousness is transferred into data crystals and sent to the Asgard so that he may be given a new clone body.
- Ayiana is unfrozen in Antarctica and spreads the plague to the team. She heals everyone except Jack O'Neill, who is sent to the Tok'ra to be implanted with Kanaan.
- Kanaan leaves Jack O'Neill. O'Neill is repeatedly tortured to death and resurrected by Baal.
- The Tok'ra locate Egeria on Pangar and set her free before she dies.
- The Pangarans share tretonin with Earth.
- Frank Simmons and Adrian Conrad steal the X-303 Prometheus. Simmons and Conrad are killed.
- SG-1 isolates the entire Replicator civilization inside a time dilation field. The Replicator Fifth is tricked into becoming part of the plan.
- The Tok'ra agree to find Harold Maybourne his own planet on which to quietly retire.
- Nirrti is killed at the hands of the victims of her genetic experimentation.
- The governments of Great Britain, France and China are informed of Stargate Command. Seeds for the International Oversight Advisory are planted.
- A Free Jaffa summit at Kresh'ta is ambushed. One hundred eight Jaffa are slaughtered. Both Teal'c and Bra'tac lose their symbiotes and must adapt to the drug tretonin.
- The Prometheus is officially launched as Earth's first interstellar vessel, but soon becomes stranded across the galaxy and begins a year-long journey back to Earth.
- The Tagrean Stargate is unburied.
- The Goa'uld Mot is killed.
- The System Lords formally disavow Anubis, despite having welcome him back into their ranks a year earlier.
- Oma Desala banishes Daniel Jackson from ascension, leaving him destitute on Vis Uban. She helps the entire Abydonian population to ascend.
- Anubis destroys Abydos.
CA. 2003-04 (SG-1 Season Seven)
- Daniel Jackson is located on Vis Uban. After gradually recovering his memories he rejoins SG-1.
- Jonas Quinn leaves SG-1 to help rebuild his planet.
- Earth's Alpha Site is moved to another planet.
- Thor stops Loki from running experiments on humans.
- SG-1 rescues the crew of the alien ship Stromos.
- Stargate Command establishes a mining treaty with the Unas of P3X-403, which will expedite the construction of BC-304s.
- Anubis develops Kull warriors to begin to phase out the increasingly rebellious Jaffa.
- Samantha Carter begins seeing Pete Shanahan.
- Osiris is removed from Sarah Gardner.
- The second Alpha Site is destroyed.
- Samantha Carter and Jacob/Selmak develop a technology to combat the Kull warriors.
- Emmett Bregman films the Stargate Command documentary.
- Janet Fraiser is killed while on an off-world mission, shot down by fire from a Jaffa staff weapon.
- Rogue N.I.D. experiments with Sekhmet come to a horrific end.
- United States President Henry Hayes takes office with Vice President Robert Kinsey.
- Jack O'Neill again downloads the knowledge of the Ancients into his mind, leading SG-1 to Proclarush Taonas to locate a Zero Point Module.
- George Hammond is relieved as leader of Stargate Command, and is sent to Washington to advise President Hayes. Elizabeth Weir takes his place.
- Anubis takes his battle to Earth.
- President Hayes learns of Robert Kinsey's treachery and forces him to resign from the office of vice president.
- SG-1 installs the Taonas Zero Point Module into the Atlantus defense system. Jack O'Neill uses it to destroy the 30 Goa'uld ships in orbit. O'Neill, near death, is placed in suspended animation.
- Cameron Mitchell, critically injured in the battle over Antarctica, begins a year of rehabilitation.
CA. 2004-05 (SG-1 Season Eight, Atlantis Season One)
- Having survived the destruction of his ship in Earth orbit, Anubis' energy essence transfers into Russian cosmonaut Anatole Konstantinov with the intention of escaping through the S.G.C. Stargate.
- The System Lords travel to Earth to ask for assistance in destroying Baal.
- The Replicators are loosed from their time dilation prison. Fifth captures and tortures Samantha Carter.
- A viable means of combating the Replicators is developed into a weapon.
- The Asgard once again erase the knowledge of the Ancients from Jack O'Neill's mind in order to save his life.
- Elizabeth Weir steps down as leader of Stargate Command. Jack O'Neill is promoted to Brigadier General and appointed leader of Stargate Command. Samantha Carter is promoted to Lieutenant Colonel.
- Fifth fabricates a Replicator duplicate of Samantha Carter.
- Elizabeth Weir leads an expedition to Atlantis in the Pegasus Galaxy.
- John Sheppard inadvertently awakens the Wraith from their millennia-long hibernation when he kills the Wraith Keeper.
- Anubis is imprisoned on KS7-535. He eventually finds a means of escaping.
- Camulus is captured by Baal.
- Tegalus nations Rand and Caledonia declare war.
- Pete Shanahan proposes marriage to Samantha Carter.
- Carson Beckett and Perna develop the Hoffan drug.
- Colson Industries declares bankruptcy.
- Atlantis and the Genii develop a tenuous relationship.
- The Goa'uld Moloc is killed.
- Teal'c's son Rya'c marries Kar'yn.
- Members of the rogue N.I.D. set off into the galaxy aboard Osiris's abandoned al'kesh vessel.
- The Genii attempt to seize Atlantis during a hurricane.
- Replicator Carter becomes impervious to the Replicator disruptor technology. Fifth is destroyed.
- Vala Mal Doran attempts to sell the Prometheus to the Lucian Alliance.
- The Atlantis expedition locates the last remaining Ancient satellite in the Lantean system.
- Elizabeth Weir Prime is revived from her stasis chamber and, before she dies, tells the story of how she saved the city.
- The Replicators enter the Milky Way Galaxy and declare war on the Goa'uld. The Goa'uld are all but defeated. The Dakara super-weapon is reconfigured to destroy the Replicators.
- Oma Desala saves Daniel Jackson from death at the hands of Replicator Carter by ascending him.
- With the Goa'uld dynasty in ruins, Baal enters hiding on Earth.
- Three Wraith hive ships begin their journey to Atlantis.
- The Quindosim refuse to hand over their Zero Point Module to the Atlantis expedition.
- Jacob Carter and Selmak die.
- Samantha Carter breaks her engagement to Pete Shanahan.
- Realizing Anubis cannot be killed, Oma Desala occupies him in a direct confrontation for all eternity.
- Daniel Jackson returns to Stargate Command.
- Atlantis transmits messages to Stargate Command.
- The Daedalus is launched as Earth's third deep-space carrier, and sets out for Atlantis.
- The Ancient satellite disables one Wraith hive ship before it is destroyed, killing Peter Grodin.
- The Wraith lay siege to Atlantis from space.
- The Daedalus arrives at Atlantis, providing them with a Zero Point Module.
- Aiden Ford leaves Atlantis.
- Atlantis conceals itself from the Wraith, making it appear as though the city has been destroyed.
CA. 2005-06 (SG-1 Season Nine, Atlantis Season Two)
- General Jack O'Neill hand picks Hank Landry to succeed him as leader of Stargate Command. O'Neill relocates to Washington D.C. to lead the newly-formed division of Homeworld Security.
- Vala Mal Doran begins joining SG-1 on missions.
- The Ori become aware of humans living under the protection of the ascended Ancients in the Milky Way Galaxy. Though they cannot confront the Ancients themselves, they begin sending missionaries to persuade the masses.
- Ronon Dex ceases being a Runner and joins the Atlantis expedition.
- The Ori destroy the planet Kallana in an attempt to install a Supergate in the Milky Way Galaxy, but they are thwarted by Vala Mal Doran. Vala herself is accidentally transported back to the Ori Galaxy.
- The Ori cause Vala Mal Doran to conceive a child without a husband. Fearing persecution by Ori followers, she marries Tomin.
- Baal acquires numerous corporations on Earth and funnels their resources into creating clones of himself.
- Carson Beckett begins to experiment with a drug which can excise Iratus DNA from Wraith, making them essentially human.
- SG-1 makes contact with the Sodan.
- Anubis's clone son Khalek provides a vital clue for the creation of a Prior inhibitor.
- The Aurora crew, still in their stasis pods, become compromised by a Wraith infiltrator posing as an officer. The knowledge of the weakness in Wraith technology is lost when the ship is destroyed.
- A Prior plague is unleashed on Earth, killing thousands. The Ancient Orlin retakes human form to create a defense.
- The Prior inhibitor is field-tested and proves largely successful at stopping the powers of the Ori Priors.
- Aiden Ford is presumed dead.
- The Ori provide Tegalus with a powerful satellite weapon, but only give it to the Rand Protectorate.
- The Earth ship Prometheus is destroyed in battle over Tegalus.
- A brief truce between Rand and the Caledonian Federation ultimately falls on deaf ears and the two nations destroy each other.
- The Odyssey, a more advanced Earth vessel and the first in a new line of deep space carriers, is launched.
- The Priors release flesh-eating insects on certain worlds which refuse to accept Origin.
- Ladon Radim leads a coup de'tat against the Genii leader Cowen. He restructures the nation's corrupt government.
- Merlin's anti-Ori reaserch is discovered by SG-1, who begin a search for the weapon he created to defeat them.
- The Sodan civilization is destroyed.
- Carson Beckett's Wraith retrovirus is successfully tested on a Wraith the expedition nicknames Michael Kenmore. However, Michael discovers his true identity on his own and escapes with the knowledge of Atlantis's location.
- The Korolev, a new deep-space carrier operated by the Russian military, is launched.
- The Ori construct a Supergate in a hidden location in the Milky Way. Priors pilot ships full of armies prepared to unleash Origin by force. Four Ori warships swiftly defeat the human, Jaffa, Tok'ra, Asgard and Lucian Alliance forces.
- The Korolev is destroyed in battle with the Ori. The ship's new commander, Colonel Chekov, is killed.
- Michael's Wraith hive forges a tentative alliance to convert all other Wraith in the galaxy into humans with the Wraith retrovirus. However Atlantis is double-crossed, as their true motivation is to locate Earth. (This is eventually thwarted.)
CA. 2006-07 (SG-1 Season Ten, Atlantis Season Three)
- Vala Mal Doran gives birth to a daughter, Adria, fathered by the Ori.
- Michael is reverted to a human once more, but the effect is only temporary. He steals a sample of Carson Beckett's blood and vows to never again to be tricked by Atlantis.
- Vala Mal Doran becomes a probationary member of Stargate Command.
- SG-1 travels to the Pegasus Galaxy to dial the Milky Way Ori Supergate. In the process an Ori warship and Wraith hive ship are defeated. The ascended Morgan Le Fay provides Daniel Jackson with crucial information before she is whisked away to be punished by the others on her plane.
- The Asurans discover that the Ancient city of Atlantis still exists and attempt to destroy it. Rodney McKay creates a back door into the Replicator base code in order to exploit their programming.
- Adria destroys the Jaffa settlement on Dakara.
- Vala Mal Doran becomes a full member of SG-1.
- The Daedalus locates the Ancient warship Tria, halfway through its journey to the Milky Way Galaxy. Learning of the current state of humanity, they return to Atlantis and retake it for themselves.
- The Ancients underestimate Rodney McKay's modifications to the Replicator base code and are defeated when the Asurans arrive. John Sheppard and his team retake the city with A.R.G.s.
- SG-1 joins Baal and Adria on a quest to track down Merlin's weapon, but instead discover Merlin himself. Before dying, Merlin transfers his consciousness into Daniel Jackson so that he may rebuild the weapon once more. Adria kidnaps Jackson.
- Carson Beckett is killed in an explosion inside Atlantis, saving the city.
- Adria transforms Daniel Jackson into a Prior of the Ori. Despite his dramatic change in appearance, the presence of Merlin's consciousness provides him with the protection from her influence. Jackson completes the weapon and sends it through the Ori Supergate aboard one of their ships, killing the ascended beings in their galaxy.
- Baal implants a clone symbiote of himself into Adria to take advantage of her knowledge and power. The Tok'ra remove the symbiote, but not before fatally wounding her. To escape death, she ascends.
- The deep-space carrier Apollo is launched, under the command of Colonel Abraham Ellis.
- The Asgard genetic degradation problem reaches an irreparable point. The race installs a computer core with an archive of their collected knowledge and technology into the Odyssey and then commits mass suicide, destroying their homeworld bringing their civilization to an end.
- Elizabeth Weir offers Jennifer Keller the position of chief medical officer following the death of Carson Beckett death.
- A preemptive strike to annihilate Replicator warships under construction (presumably to assault Atlantis or, eventually, Earth) brings down the full wrath of the Asurans on Lantea. Elizabeth Weir is severely injured during Atlantis's flight from the planet.
CA. 2007-08 (Atlantis Season Four, The Ark of Truth)
- SG-1 takes the Odyssey into the Ori Galaxy to locate the Ark of Truth, a technology originally created by Amelius long ego to forcibly brainwash the opposing Asurans. The ark is unveiled before the Doci, who communicates his knowledge to all other Priors. The ascended Adria is then confronted by Morgan Le Fay and engaged in eternal combat -- effectively bringing the Ori threat to an end.
- Elizabeth Weir sacrifices herself so that John Sheppard's team may succeed in stealing a Zero Point Module from Asuras in order to save Atlantis.
- Rodney McKay reactivates the Replicators' original base command to assault the Wraith, provoking a new conflict in the Pegasus Galaxy.
- Atlantis settles on a new home world. Following the loss of Elizabeth Weir, Samantha Carter is made leader of the expedition.
- John Sheppard forms a loose affiliation with the Travelers.
- Teyla Emmagan becomes pregnant with Kanaan's child.
- The Asurans switch tactics and begin eliminating human worlds in an effort to destroy the Wraith's food supply.
- Atlantis forces join with the Wraith and Travelers to destroy Asuras and end the Replicator threat once and for all.
- A Wraith cloning facility is destroyed.
- On Earth, John Sheppard's father dies.
- Ronon Dex teams up with Teal'c to halt a Wraith invasion of Stargate Command. The I.O.A. approve Teyla Emmagan and Ronon's positions on Sheppard's team.
- Michael unleashes a modified version of the Hoffan drug on the Pegasus Galaxy.
- A clone of Carson Beckett is recovered from Michael, but without a vital injection from Michael he is forced into suspended animation in Atlantis.
- Michael captures Teyla Emmagan to use her child for his own purposes.
CA. 2008 (Atlantis Season Five, Continuum)
- Teyla gives birth to Torren Emmagan. She and Kanaan are rescued from Michael and return to Atlantis.
- Samantha Carter is recalled for Baal's symbiote extraction ceremony. Richard Woolsey takes her place as leader of the Atlantis expedition.
- Baal travels back in time to 1939. In the present, his last clone symbiote is extracted from the clone host.
- A splinter group of Asuran Replicators, lead by Elizabeth Weir, seek flesh-and-blood bodies in order to achieve their ultimate goal of ascension. Replicator Weir realizes that her new allies will never cease being a threat and leads them through to a space Stargate.
- Rodney McKay and Jennifer Keller begin a romantic relationship.
- Teyla Emmagan is genetically altered to take the place of the queen in the Wraith Todd's fleet.
- Daniel Jackson visits Atlantis to discover the secret lab of Janus. The accidental activation of Janus's Attero console attracts a renegade faction of Asgard to the base, who kidnap Jackson and Rodney McKay.
- Rodney McKay activates the Attero device, destroying all Wraith hive ships in -- or entering -- hyperspace. The device is later destroyed and McKay and Jackson are rescued.
- Sheppard's team is placed on trial for their crimes in the Pegasus Galaxy. Richard Woolsey advocates on their behalf before an alien court.
- Michael and his men storm the Atlantis command tower to capture Torren Emmagan and destroy the city. The Stargate is remotely activated, destroying the Puddle Jumper he arrived in. On one of the city's rooftops, Teyla forces Michael to fall to his death.
- George Hammond dies of a heart attack.
- The Earth deep-space carrier Sun Tsu is launched.
- Samantha Carter takes command of the Earth's latest deep-space cruiser, the U.S.S. George Hammond.
- A set of coordinates in an alternate reality clue a massive hive ship to the location of Earth. Atlantis returns to the Milky Way to eliminate the threat before landing in San Francisco bay.
CA. 2009-10 (SGU Season One)
- Icarus Base personnel and guests are forced to evacuate to the Ancient ship Destiny during a surprise attack. With Earth several billion light years away the small band of survivors prepare for a long journey.
- Homeworld Command enacts their plan to forcibly remove Colonel Young from command of Destiny, draining her weapon reserves so that they may attempt to dial Earth while she is recharging within a star. Dr. Nicholas Rush rigs a light show to force Colonel Telford and his team to retreat from the ship. Young, now restored to command, makes it clear to the Pentagon that he is in charge of the ship -- whether they like it or not. The Destiny crew begin to settle in for the long voyage ahead.
- Rush frames Colonel Young for the death of Spencer, who committed suicide from cabin fever. Young coaxes this information from Rush while alone on a planet. A fight ensues and Young, having beaten Rush unconscious, leaves him for dead.
- The blue aliens reveal themselves and dogfight with Destiny and her shuttle in order to buy time to capture Chloe Armstrong. Colonel Young uses the communication stones to switch bodies with one of the blue aliens, who somehow possess a stone of their own, until he discovers a confined Dr. Rush. Young sets him free, and Rush and Chloe escape with a shuttle.
- The Destiny crew come upon an artificially created world. A group of the ship's compliment take extended shore leave on the planet while Destiny is out of range, but ultimately several choose to stay permanently. They designate this new world as Eden.
- Lt. Johansen reveals she is pregnant with Colonel Young's baby, the result of an affair prior to their arrival on Destiny.
- Chloe Armstrong begins to show signs that she was experimented on by the blue aliens and is undergoing a gradual transformation.
- Destiny departs the galaxy, crosses a great expanse at F.T.L., and enters a new galaxy.
- The Lucian Alliance uses a naquadria-enriched planet to dial Destiny and seize the ship by force. Ultimately their leader is defeated and the remaining alliance members are placed under lockdown.
- Telford reaches Destiny with the Lucian Alliance.
- T.J. loses her baby in a Lucian gunfight in the medical bay. Destiny, recognizing the medic's emotional well-being is key to the mission as a whole, creates an elaborate hallucination to convince her an omnipresent race transferred her unborn child back to Eden to be raised by the settlers.
- Earth celebrates the tenth anniversary of its alliance with the Aschen. Only then is it discovered that the Aschen are slowly exterminating humanity by preventing births. SG-1 regroups to send a message into the year 2000. (Defunct timeline) ("2010")
CA. 2010-11 (SGU Season Two)
- Nicholas Rush cracks Destiny's master control code and discovers the bridge, soon discovering the ship's true mission -- though he keeps it to himself for several weeks.
- Lt. Riley is critically injured on an away mission, and ultimately suffocated by Colonel Young to end his suffering.
- Destiny catches up to a seed ship under the control of the Ursini, a nearly extinct alien species. Colonel Telford becomes trapped on their ship when they return to F.T.L. in the middle of a battle.
- Destiny drops out of F.T.L. and only resumes its course when it is confident Colonel Young has digested his grief for killing Riley and is fit to command the crew.
- Rush's secret trips to the bridge are discovered, and he is forced to reveal Destiny's true mission to his colleagues.
- The Lucian Alliance soldier Simeon kills Amanda Perry and Ginn and escapes to a desert planet. Several teams follow him, believing he has critical information regarding an imminent attack on Earth. Rush, however, tracks him down and kills him for murdering the woman he loved.
- The crew left behind on "Eden" mysteriously return in range of Destiny aboard what appears to be a fully restored shuttle, only to gradually replay their deaths from a terrible winter on the planet. T.J. discovers her child is not among the crew.
- Destiny enters a conflict with a fleet of drone ships left behind after an ancient war. The Ursini return aboard their seed ship and return Colonel Telford to the crew. The Ursini are ultimately destroyed by the drones.
- Chloe's transformation by the blue aliens is nearly complete, and she summons them to assist in the fight against the drones. Lt. Scott returns her to them, and they appear to remove whatever was transforming her body.
- Destiny and her crew are duplicated, the crew being sent 2,000 years into the past, and Destiny back in time a handful of hours. Only Nicholas Rush and David Telford remain from the original timeline. The duplicated Telford is killed by Dr. Rush Prime. Dr. Rush Prime appears to be destroyed along with Destiny Prime when the ship sinks into a star.
- A Lucian Alliance terrorist attack on Earth is thwarted by Camille Wray and Ronald Greer.
- Dale Volker's kidneys begin to fail, and Ronald Greer donates one of his.
- The consciousness of both Amanda Perry and Ginn are discovered floating in the ether of space. Using Chloe and the communication stones, both women's minds are downloaded into Destiny's mainframe.
- An attempt to use Langara's naquadria core as a power source to dial the ninth chevron fails when their government discovers Earth's duplicity.
- The remaining surviving Lucian Alliance officers, save for Varro, are killed during a rescue mission.
- The Destiny crew discovers a human colony of Novans and the truth about what happened to their counterparts. The people are rescued from their planet to return home to Novus. Upon arrival, it is apparent that Novus suffered a geological cataclysm that is still destroying the planet. Destiny downloads as much of the Novan archive as possible before it is destroyed, and the ship sets course to deposit the remainder of the Novans on a new world.
- T.J. discovers she will contract Lou Gehrig's disease in five years.
- When the drones' plan to block all Destiny-compatible stars in the galaxy is fully realized, Eli convinces Colonel Young that their only alternative is to "skip" the rest of the galaxy by putting the crew in stasis. But the crew is short one stasis pod, which is broken, and Eli volunteers to stay conscious in the hopes that he can discover a solution.
- SG-1 enters the Stargate in 1969 a few moments too soon, which sends them far into the future. An aged Cassandra uses advanced technology to send them back to 1999. ("1969")