Jerry Lewis as Brendan Byers III

Jan Murray as Sid Hackle

John Wood as Finkel

Steve Franken as Peter Bland

Willie Davis as Lincoln

Dack Rambo as Terry Love

Robert Middleton as Colonico

Kaye Ballard as Senora Messina

Harold J. Stone as . General Buck

Paul Winchell as Schroeder

Sidney Miller as Hitler

Joe Besser as Dock Master

Kathleen Freeman as Bland's Mother

George Takei as Yamashita

Mike Mazurki as Rocky (uncredited)

Doodles Weaver as Von Pabst (uncredited)

William Wellman Jr. as Sgt. Mosgrove (uncredited)

James Joyce as German Officer

Joe Scott as German Officer (uncredited)

Anthony Larry Paul as SS Guard (uncredited)

Susan Evans as Pregnant Girl (uncredited)

Art Lewis as SS Guard (uncredited)

Neil Hamilton as Chief of Staff (uncredited)

Joe E. Tata as Corporal (uncredited)

William O'Connell as Mr. Prescott (uncredited)

Roland La Starza as Von Krebs (uncredited)