Stargate Atlantis: Season 1, Episode 12

1 - 12: The Defiant One

Leading an exploration of an ancient weapons satellite in deep space, Major Sheppard and Dr. McKay intercept a Wraith distress signal. Deciding to investigate, the team lands on a nearby planet and finds the source of the call - a downed Wraith cargo ship. When the unseen Wraith awakens from hibernation, Sheppard and McKay become the focus of its ravenous appetite.