The storyline for this entry is a can't-miss premise, first used in the 1936 British feature "The Man Who Changed His Mind," aka "The Man Who Lived Again" in the US. Hammer veteran John Carson ("The Plague of the Zombies," "Taste the Blood of Dracula," "Captain Kronos: Vampire Hunter") stars as Professor Allen W. Meredith, working to earn a small allowance from his conniving, cutthroat employer, Jack Gregory (Jack Hedley). Meredith has created a machine that can transfer the mind of one person into the body of another, and schemes with his wife Ann (Alethea Charlton) to make the switch with Gregory to increase their finances. Ann uses her feminine charms to easily lure the womanizing Gregory to their flat, and successfully pull off the switch. The mild mannered Meredith, in Gregory's body, has great difficulty dealing with his employer's many vices, while a captive Gregory, in Meredith's body, manages to smooth his way into the good graces of the Professor's newly aroused wife. A puzzled Mrs. Gregory (Sonia Graham) seems pleased by the almost caring change in her formerly faithless husband, who doesn't even complain about catching her with another man. Gregory's other problems include a painful ulcer and an unpaid commission owed to two gangsters. When the time comes to reverse the process, Mrs. Meredith decides that she prefers her new, sly husband over the old one. Both John Carson and Jack Hedley are quite convincing in their dual roles, while Alethea Charlton (who died only five years after this broadcast) also scores as the sexy, shallow wife, whose character uncannily echoes the one played by Jacqueline Bisset in 1971's "The Mephisto Waltz." Still, the best version of this story is the 1936 Boris Karloff feature, which co-starred Anna Lee as the female scientist who produces a happy ending. This episode was shot on video, like the Brian Clemens THRILLER episodes which made their way to the US in the late 1970s.