A peaceful, primitive society of tribal settlers, brought from Earth thousands of years ago to be slaves of the Goa'uld. They can be identified by red, ornate tattoos on their temples which run down portions of their face.
Nassyans were opening negotiations with Earth when the Goa'uld Cronus attacked with a squadron of death gliders and troops in the hopes of capturing Jolinar of Malkshur, who was also being hunted by one of Cronus' Ashrak.
SG-1 aided in the evacuation of the Nassyans to Earth via the nearby Stargate in the midst of the attack. They were successful at rescuing the majority of the population, though there were a number who were killed in the attempt. In the days that followed, the Nassyans who had been injured were moved to a base near Stargate Command to receive treatment, until the S.G.C. had found a new home world where they could live out their lives in peace, far from the shadow of the Goa'uld.
In the Line of Duty - The Nassyans fall under attack by the Goa'uld System Lord and are evacuated to the S.G.C.