Matthew Walker

A scientist working on advanced propulsion technology is killed by a disabled janitor, Roland, who then corrects the man's calculations. Mulder and Scully investigate and find that another recently deceased scientist, whose head is cryogenically frozen, was Roland's twin brother and is controlling him telepathically from beyond the grave.

Mulder and Scully search for the truth when an anthropologist discovers what could be the frozen remains of extraterrestrial life.