Leading an exploration of an ancient weapons satellite in deep space Major Sheppard (Joe Flanigan) and Dr. McKay (David Hewlett) 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.