Avon (Paul Darrow) endeavors to enlist the aid of Muller (John Westbrook), a cybernetics expert. But an accident reveals that Muller is not Muller at all, but instead the scientist's lookalike, an insane android. Now the crew of the Scorpio must prevent Muller's electronic clone from merging its intellect with the computer Orac, as part of a master plan to take over the universe. "Headhunter" was originally broadcast on November 2, 1981. ~ Hal Erickson, Rovi