When Lt. Colonel John Sheppard (Joe Flanigan) is informed that his father has passed away he packs a few things and, accompanied by Ronan (Jason Momoa), heads back to Earth to attend the funeral. There, Ronan gains some insights to his friend's past - Sheppard's troubled relationship with his father and brother, as well as his ex-wife Nancy, a director with Homeland Security. Before long, they are approached by a woman, Ava Dixon, who claims to know about a covert project involving nanite programming. Sheppard's worst fears are realized when she leads them to a high tech lab and reveals that she and her partner have been successful in creating a human form Replicator - a Replicator now loose somewhere in the city who must be recaptured at all cost.