 Mulder and Scully travel to the secretive Area 51 to meet a contact who has inside information on UFOs. Before they arrive, they get stopped by military personnel who tell them to turn back. A weird event occurs that results in Mulder switching bodies with Morris Fletcher, a "man in black" from Area 51, without anyone else knowing. Mulder takes advantage of this perfect disguise to infiltrate Area 51, while Fletcher uses the opportunity to escape the life he hates.