Season 1 (2004–05) The series picks up the story arc from
Stargate SG-1's "
Lost City", where people from all around the world come together to form an expedition and discover the wonders of
Atlantis. Discovering that they have been cut off from
Earth, they must fend for themselves, and discover a powerful new enemy bent on human subjugation.
Season 2 (2005–06) The story continues when the Daedalus arrives and renews the expedition's connection to
Earth. This takes place alongside the
Ori story arc in SG-1, and the
Wraith become an even larger threat in the
Pegasus Galaxy. But what they deal with in their second year might be more than they can handle, and Dr.
Carson Beckett's retrovirus is more trouble than it's worth.
Season 3 (2006–07) This season concentrates on more character-driven stories. Along with new insight on the characters, the expedition discovers a new threat, one that could be the precursor to the Replicators. Some important characters leave the series in this season, and the fate of Atlantis once again is in the hands of the humans from Earth.
Season 4 (2007–08) Amanda Tapping (
Col. Samantha Carter) joined the cast as a regular for 14 episodes,
Jewel Staite (Dr.
Jennifer Keller) became a recurring character for eight episodes, while regular cast member
Torri Higginson (
Dr. Weir) became a recurring cast member for four episodes. The season started September 28, 2007, airing on the SCI FI channel in the United States. In the United Kingdom, the season premiered on Tuesday, October 9, 2007 on
Sky One.
Season 5 (2008–09) After being a regular character in season four,
Amanda Tapping (Colonel
Samantha Carter) became a guest star in several episodes.
Robert Picardo (
Richard Woolsey) joined the cast as a permanent character as Woolsey assumes command of Atlantis. Actress
Jewel Staite (Dr.
Jennifer Keller) was promoted from a recurring character to a permanent cast member.
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 had stated that she would not be reprising her role as Dr.
Elizabeth Weir in the fifth season.
Rainbow Sun Francks as Aiden Ford was given a brief cameo appearance in "Search and Rescue". This was the last season of
Stargate Atlantis. == DVD & Blu-ray releases ==