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RATINGS SCORECARD GATEWORLD - * * 1/2 FAN POLL - 8.64 SCI FI RATING - 0.9 SYNDICATION RATING - 0.6 Season Ratings   DOWNLOAD FULL EPISODE:   EPISODE NUMBER - 406 DVD DISC - Season 4, Disc 2 ORIGINAL U.S. AIR DATE - 11.02.07 SYNDICATION AIR DATE - 10.20.08 WRITTEN BY - Alan McCullough DIRECTED BY - Martin Wood GUEST STARRING - Jewel Staite (Jennifer Keller), David Nykl (Radek Zelenka), Kavan Smith (Lorne), Brenda James (Katie Brown), Zach Selwyn (Scientist), Niall Matter (Lt. Kemp), Linda Ko (Nurse), Joel Cottingham (Doctor), Graem Beddoes (Scientist), D. Harlan Cutshall (Marine), Robert Clark (Dr. Gerald Baxter) When a virus causes amnesia in everyone except Teyla and Ronon, the Atlantis team must work together to find a cure before their memories fade entirely.

PRODUCTION Attack of the Show's Zach Selwyn makes a cameo appearance as a scientist in this episode, having been invited by the studio to appear after creating a rap video for the G4 cable show about wanting to be on Stargate Atlantis. Actor D. Harlan Cutshall, who plays a Marine in this episode, played the Jaffa commander all the way back in the Stargate SG-1 third season episode "Maternal Instinct." "We watched the Day One Mix of 'Tabula Rasa' today. Another winner! The teaser felt like something out of the movie 'Saw.' A very unique-looking episode that Marty G. predicts 'the fans are gonna love.'" (Executive producer Joseph Mallozzi, in a post at his blog)