An entertaining 60s British horror set in swinging London. Boris Karloff, in one of his last roles, plays Professor Montserrat who has developed a new technique of mind control and now only needs a bored young man to test it on. Enter Mike Roscoe, played by Ian Ogilvy. After the Professor and his wife hook Mike up to their machine and conduct some psychedelic experiments they have the power to control the young man's mind and to experience his sensations. But whilst the Professor wants to use their new power for good his wife becomes more and more obsessed with their power and the sensations it provides and the whole thing goes out of control. Karloff gives a good performance, and there are some "groovy" nightclub scenes plus a small role for Susan George. Overall low budget but extremely watchable.