Chemist Dr. Barnaby Fulton (Cary Grant) is developing a pill that will defy the aging process for the pharmaceutical company run by Oliver Oxley (Charles Coburn). When a loose chimpanzee mixes chemicals together that produce this effect, Fulton tries some on himself. This prompts him to act like a teenager, making passes at Oxley's buxom secretary, Lois (Marilyn Monroe). Soon everyone, including Fulton's wife, Edwina (Ginger Rogers), is feeling the effects of the formula, with hilarious results.
Director: Howard Hawks
Producer: Sol C. Siegel
Cast: Cary Grant, Ginger Rogers, Marilyn Monroe, Charles Coburn, Hugh Marlowe, Henri Letondal, Robert Cornthwaite, Larry Keating, Douglas Spencer, Esther Dale, Joseph Mell, George Eldredge, George Winslow, Emmett Lynn, Kathleen Freeman, Olan Soule, Harry Carey Jr., John McKee and Heinie Conklin