Stargate Atlantis 2004 - 2009 : List of All Seasons

Season five of Stargate: Atlantis began airing July 11, 2008 on the Sci Fi Channel. The final season of the series concluded after 20 episodes. After being a regular character in season four Amanda Tapping (Colonel Samantha Carter) became a guest star in several episodes of season five. Robert Picardo (Richard Woolsey) joined the cast as a permanent character, as Woolsey assumed command of Atlantis. Jewel Staite (Dr. Jennifer Keller) was also promoted from recurring character to permanent cast member. Both Michael Shanks (Dr. Daniel Jackson) and Paul McGillion (Dr. Carson Beckett) appeared as guest stars in this season, with McGillion appearing in five episodes. Actress Torri Higginson did not reprise her role as Dr. Elizabeth Weir in the fifth season. Other season five regular cast members include Joe Flanigan, Jason Momoa, Rachel Luttrell, and David Hewlett respectively.

Season four of Stargate Atlantis, an American-Canadian television series, began airing on September 28, 2007 on the US-American Sci Fi Channel. The fourth season concluded after 20 episodes on March 7, 2008 on Sci Fi. The series was developed by Brad Wright and Robert C. Cooper, who also served as executive producers. Amanda Tapping joins the cast as a regular for 14 episodes, Jewel Staite was a recurring character for eleven episodes, while regular cast member Torri Higginson was a recurring cast member for four episodes. Other season four regular cast members include Joe Flanigan, Jason Momoa, Rachel Luttrell, and David Hewlett.

Season three of Stargate Atlantis, an American-Canadian television series, began airing on July 21, 2006 on the US-American Sci Fi Channel. The third season concluded after 20 episodes on February 5, 2007 on the Canadian The Movie Network. The series was developed by Brad Wright and Robert C. Cooper, who also served as executive producers. Season three regular cast members include Joe Flanigan, Torri Higginson, Jason Momoa, Rachel Luttrell, Paul McGillion, and David Hewlett as Dr. Rodney McKay.

The second season of the television series Stargate Atlantis commenced airing on the Sci Fi Channel in the United States on July 15, 2005, concluded on The Movie Network in Canada on January 30, 2006, and contained 20 episodes. The show itself is a spin off of its sister show, Stargate SG-1. The series was developed by Brad Wright and Robert C. Cooper, who also served as executive producers. Season two regular cast members include Joe Flanigan, Torri Higginson, Jason Momoa, Rachel Luttrell, Paul McGillion, and David Hewlett as Dr. Rodney McKay. The second season focuses on the Atlantis Expedition continuing to make the Wraith think that they self-destructed the city while continuing to explore Pegasus and hunt for ZPMs this means at times lying to new allies about the city even sometimes claiming to be a small contingent that escaped the Siege; the season also marks the first time the Expedition is able to make contact with Earth although doing so uses a lot of power so the contact is at often times via the Daedalus, an intergalactic Earth-Asgard vessel commanded by Col. Steven Caldwell who makes clear his desire to be Military Leader of Atlantis but eventually settles for a sort of advisory role as it becomes clear that Dr. Weir and the Lt.Col Sheppard are a duo not to be messed with. The central plot of the second season is the development of Dr. Beckett's retrovirus, which can, theoretically, turn a Wraith into a human.

The first season of the television series Stargate Atlantis commenced airing on the Sci Fi Channel in the United States on July 16, 2004, concluded on The Movie Network in Canada on January 31, 2005, and contained 20 episodes. The show was a spin off of sister show, Stargate SG-1. Stargate Atlantis re-introduced supporting characters from the SG-1 universe, such as Elizabeth Weir and Rodney McKay among others. The show also included new characters such as Teyla Emmagan and John Sheppard. The