Stranded on a "ghost ship," Mulder and Scully must unravel the mystery of an unearthly force that is causing them to age at an accelerated rate.
The agents' pursuit of a man who seems to possess strange powers leads to the discovery of a dangerous secret from Mulder's past.
In Seattle the team investigates a man's attack on his boss, who he thought was a ram-horned demon; Broyles has a disconcerting meeting with Nina Sharp of Massive Dynamic.
Circumstantial evidence keeps piling up against the shelter manager in the case of the missing girl.
A serial killer and his cell mate escape from a mental institution to take revenge on a police detective.