Stargate Command has sent a team to investigate the Ancients' city of Atlantis in the Pegasus Galaxy. The team is led by Dr. Elizabeth Weir (Torri Higginson) and Major John Sheppard (Joe Flanigan). While they are exploring the Pegasus Galaxy, they accidentally awakens the deadly Wraiths, a race of creatures that survive by sucking the life out of human beings.
It's the second TV show of the franchise. It takes the same concept, put new people in a team, and take them to different worlds. At the start of season 4, they decided to blow up the team by replacing Dr Weir to energize the show. What it did instead was crumple up any chemistry this show had. The producers probably had good reasons to try but it sped up the show's demise after 5 seasons.
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