Tony Randall as Prof. Daniel Potter

Shirley Jones as Janice Claridge

Edward Andrews as Griswald

Howard Morris as Sweeney

Ernest Truex as Claridge

Jim Backus as Sergeant

Frank Faylen as Catfish

Celia Milius as Sally Brighton

Dick Sargent as Tommy

Adam Roarke as Bob Brighton

Whit Bissell as Dr. Braden

Harriet E. MacGibbon as Mrs. Claridge

Jim Boles as Pete

Parley Baer as Police Captain

Connie Gilchrist as Maid

Kathleen Mulqueen as Elderly Lady