Stargate Atlantis is a spin-off from the television series Stargate SG-1, which in turn was based on the film Stargate (1994). It premiered on the US Sci Fi Channel on July 16, 2004 with “Rising”, a movie-style two-part episode, which guest starred Richard Dean Anderson, Michael Shanks and Robert Patrick.
The events of Stargate Atlantis follow the cliffhanger Stargate SG-1 seventh season finale “Lost City”, and the Season 8 premiere “New Order” when the Stargate Command launches the Atlantis expedition to travel to the lost city of Atlantis (discovered in the seventh season of SG-1). When the expedition arrives in the Pegasus Galaxy, knowing that there is no way back to Earth, they discover a new powerful enemy: the Wraith.

Stargate Atlantis is a spin-off from the television series Stargate SG-1, which in turn was based on the film Stargate (1994). It premiered on the US Sci Fi Channel on July 16, 2004 with “Rising”, a movie-style two-part episode, which guest starred Richard Dean Anderson, Michael Shanks and Robert Patrick.
The events of Stargate Atlantis follow the cliffhanger Stargate SG-1 seventh season finale “Lost City”, and the Season 8 premiere “New Order” when the Stargate Command launches the Atlantis expedition to travel to the lost city of Atlantis (discovered in the seventh season of SG-1). When the expedition arrives in the Pegasus Galaxy, knowing that there is no way back to Earth, they discover a new powerful enemy: the Wraith. [less]