Jerry Lewis as Gerald Clamson

Harold J. Stone as Thor

Susan Bay Nimoy as Suzie Cartwright

Buddy Lester as Studs

Del Moore as Mr. Hodges

Paul Lambert as Moxie

Jeannine Riley as Bambi Berman

Leonard Stone as Fong

Charlie Callas as Rex

Frank De Vol as Bogart

Harland Sanders as Himself (uncredited)

George Takei as Diamond Jeweler (uncredited)

Pete Peterson as Water Skiier (uncredited)

Vern Rowe as Gunner

David Lipp as Lizard

Vincent Van Lynn as Fancher

Mike Mahoney as Detective #1

Walter Kray as Detective #2

Eddie Ryder as Specs

Murray Alper as Ed - Motorcycle Officer (uncredited)

Vince Barnett as Man at Telephone Booth (uncredited)

Barbara Burgess as Girl on Beach (uncredited)

Charo as Mexican Maid (uncredited)

Corinne Cole as Stewardess (uncredited)

Harry Fleer as Male Nurse (uncredited)

Med Flory as Male Nurse (uncredited)

Percy Helton as Sanitation Man (uncredited)

James Jeter as Police Lieutenant (uncredited)

Ray Kellogg as Police Sergeant (uncredited)

Don Kennedy as Marine Sergeant (uncredited)

Robert Kino as Asian Man (uncredited)

Roland La Starza as Jack - Motorcycle Officer (uncredited)

Florence Lake as Assaulted Lady (uncredited)

Scot Lewis as Guy on Beach (uncredited)

John Macchia as Lifeguard (uncredited)

Howard Morris as Cameo Role (uncredited)

William O'Connell as Psychiatrist (uncredited)

Iris Rainer as Girl on Beach (uncredited)

Tony Regan as Hotel Guest / Tourist (uncredited)

Rob Reiner as Guy on Beach (uncredited)

Michael Ross as Bald Man (uncredited)

William Wellman Jr. as Harold - Bellboy / Car Hop (uncredited)

John Nolan as F.B.I. Agent