Jerry Lewis as Willard Woodward / James Peyton / Everett Peyton / Julius Peyton / Eddie Peyton / Skylock Peyton / Bugs Peyton

Donna Butterworth as Donna Peyton

Sebastian Cabot as Dr. Matson

Neil Hamilton as Attorney

Jay Adler as Attorney

Anne Baxter as Anne Baxter

Robert Strauss as Pool Player

Jesslyn Fax as Airline Passenger

Renie Riano as Airline Passenger

Herbie Faye as Joe

Norman Leavitt as Gas Station Attendant

Ellen Corby as Airline Passenger

Marjorie Bennett as Airline Passenger

Vince Barnett as Automobile Owner at Gas Station

Milton Frome as Pilot

John Hubbard as Pilot

Benny Rubin as Sign Painter

Gerald Mohr as Movie Actor

Gene Baylos as Clown