Tony Curtis as David Wilson

Dean Martin as Michael Haney

Janet Leigh as Ann Wilson

James Whitmore as Harry Powell

John McIntire as Bob Doyle

Barbara Nichols as Gloria Coogle

Larry Keating as Parker

Larry Storch as Orenov

Simon Oakland as Belka

Joi Lansing as Florence Coogle

Barbara Hines as Foreign Exchange Student

Marion Javits as Miss Mellish

Mike Lane as Glinka

Larri Thomas as Girl

Dyanne Thorne as Sexy Woman

Kam Tong as Lee Wong

Larri Thomas as Pinup Girl

Emil Sitka as Man with Flower Pot

Jack Benny as Mr. Cosgrove

Mark Allen as Joe Bendix (uncredited)

Leon Alton as Restaurant Patron (uncredited)

Jack Benny as Mr. Cosgrove (uncredited)

Larry J. Blake as Tenant (uncredited)

William Boyett as Howard (uncredited)

Wally Brown as Irate Man on Telephone (uncredited)

Boyd Cabeen as Restaurant Patron (uncredited)

Alan Carney as Building Superintendent (uncredited)

George Ford as Restaurant Patron (uncredited)

Art Gilmore as Television Announcer (uncredited)

Joe Gray as Undetermined Role (uncredited)

Ron Hayes as F.B.I. Man (uncredited)

Bert Madrid as Restaurant Patron (uncredited)

Harold Miller as Military Officer (uncredited)

George Nardelli as Restaurant Patron (uncredited)

William Newell as Schultz (uncredited)

William H. O'Brien as Passenger Exiting Elevator (uncredited)

Murray Pollack as Restaurant Patron (uncredited)

Harry 'Snub' Pollard as Tattoo Artist (uncredited)

Fred Rapport as Restaurant Patron (uncredited)

Frank J. Scannell as Tenant (uncredited)

Scott Seaton as Observer on Street (uncredited)

Emil Sitka as Man with Flower Pot (uncredited)

Rudy Solari as FBI Man at Empire State Building (uncredited)

Larri Thomas as Girl (uncredited)

Peter M. Thompson as F.B.I. Man (uncredited)

Dyanne Thorne as Bit Role (uncredited)

Kam Tong as Lee Wong (uncredited)

Arthur Tovey as Guard Exiting Elevator (uncredited)

Herbert Winters as Man Outside Chinese Restaurant (uncredited)

John Ward as Gibson (uncredited)