At a French restaurant, The Monkees play at a testimonial dinner for Professor Milo Schnitzler, a nuclear scientist, who delivers a speech. The guest of honor hands Peter a note saying that he is being taken to The Remington Clinic, a rest home. After giving the note to Mike, Peter is knocked unconscious, and is dragged off, too. Worried about Peter's disappearance, Mike takes out the note that Peter gave to him. The Monkees set out for The Remington Clinic, where they ask a nurse of the whereabouts of Peter, but she tells them to go to a policeman. Micky, Mike and Davy take a policeman to the French restaurant where Peter was seen last, but it has been altered to resemble The Orient, with Dr. Marcovich, a master spy, disguised as a Chinese waiter. The boys try to smuggle Davy in, disguised as an accident victim, but fail again, and Davy consumes a cough drop that induces spells of singing and dancing to the tune of "Old Folks at Home (Way Down Upon the Swanee River)." The three climb up a ladder, break inside the hospital, and disguise themselves as patients. Meanwhile at the clinic, Schnitzler has been drugged and Peter tied up. Marcovich tells Bruno, his aide, that they are transporting Schnitzler out of the country.
When they leave, Peter, in homage to an old C.C. Beck-created superhero, shouts "Shazam!," but a bolt of lightning shatters a mirror ("Well, another seven years bad luck for Captain Marvel!"). Micky, Mike and Davy are given harsh physical therapy by Bruno, while Peter has a dose of Marcovich's sinister brain drain. Micky, Mike, and Davy abandon all hope until they finally find Peter-who claims he doesn't know them! When they scare Peter to restore his memory, they learn of Schnitzler's predicament and find that Marcovich and Bruno plan to operate on Schnitzler and smuggle him out of the country in an ambulance (overseas?!?!). They force Micky to take Schnitzler's place when they hear Marcovich and Bruno arrive, and, garbed as doctors, Mike, Davy and Peter take over the operation. Outwitted for a time, Marcovich finally discover he is dealing with The Monkees. A mad musical chase set to "(I'm Not Your) Steppin' Stone" ends in the physical therapy room, where the boys turn the equipment against the villains. Sure that they should undoubtedly get 20 years from a federal judge, and probably get a good wrist-slapping from the American Medical Association, The Monkees set off in their Monkeemobile. Case closed.