Ambushed and imprisoned aboard a rogue human-run ship, Lt. Col. Sheppard (Joe Flanigan) is threatened with death by its attractive female commander, Larrin (Jill Wagner), unless he helps her reactivate a dormant Lantean spaceship. A nomadic group of travelers live on this rundown vessel, part of a greater armada, and their need for new ships has become critical. As soon as Sheppard steps aboard, he discovers that the Lantean ship, abandoned after an attack by the Wraith, is now emitting deadly radiation. Unbeknownst to Larrin, Sheppard manages to send out a sub-space distress signal - but the signal attracts a Wraith cruiser. As the team searches for him, Sheppard's resourcefulness is put to the test as he tries to stay alive, with or without Larrin's help.