Randall & Hopkirk (Deceased) S01E02 - A Disturbing Case

Hearing Jeff talk to Marty, Marty's wife Jeannie believes he has snapped and he is referred to a psychiatric unit run by Dr. Conrad. Marty goes to visit him and learns that Conrad is a criminal who hypnotizes people into giving him their valuables, but Conrad gets Jeff to tell him about Marty and then erases him from Jeff's memory by using drugs. Marty overcomes this by impersonating Dr. Conrad's voice and hypnotizing Jeff into believing he is a karate expert and foiling the next crime.