A fisherman crosses paths with a diamond-smuggling gangster–who is his doppelgänger—and inadvertently takes his place at a resort hotel where he meets a special girl.
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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)