Ronon Dex is captured by the Wraith and returned to his homeworld, where he is haunted by his past as he is forced to once again become their prey.

During an off-world mission Colonel Sheppard unknowingly becomes host to an alien entity, which infects others in Atlantis and afflicts them with terrifying nightmares.

In the city of Las Vegas in an alternate reality, police Detective John Sheppard investigates a series of bizarre murders where each body appears to have desiccated. He is soon called to Area 51, where Dr. Rodney McKay explains the situation.