While on personal leave on Earth, Sheppard and Ronon learn that scientists have engineered a human-form Replicator -- who is now on the loose.
- Directed by
- Andy Mikita
- Written by
- Joe Flanigan, Carl Binder
Guest stars
All episodes — Season 4
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S4 E1Adrift (2)
Sep 27, 20078.244 min
Floating in deep space with the city's protective shield failing, the team must do all they can to keep Atlantis alive. A radical injury threatens Dr. Weir's life.
S4 E2Lifeline (3)
Oct 4, 20078.443 min
Colonel Sheppard and his team embark on a risky mission to steal a Z.P.M. power module from the Replicators -- but must rely on a compromised Dr. Weir to succeed.
S4 E3Reunion
Oct 11, 20077.644 min
When a group of Ronon's people enlist the team's help in raiding a Wraith weapons facility, Ronon reconsiders whether his future lies in Atlantis or with his friends.
S4 E4Doppelganger
Oct 18, 20077.343 min
During an off-world mission Colonel Sheppard unknowingly becomes host to an alien entity, which infects others in Atlantis and afflicts them with terrifying nightmares.
S4 E5Travelers
Oct 25, 20077.643 min
Colonel Sheppard is captured by the inhabitants of a generational ship and their beautiful leader, who wish to use his ability to use Ancient technology for their own ends.
S4 E6Tabula Rasa
Nov 1, 20078.144 min
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.