The Incredible Mr. Limpet

Don Knotts

— Henry Limpet

Carole Cook

— Bessie Limpet

Jack Weston

— George Stickel

Andrew Duggan

— Harlock

Larry Keating

— Admiral P.P. Spewter

Oscar Beregi Jr.

— Nazi Admiral (as Oscar Beregi)

Charles Meredith

— Fleet Admiral

Elizabeth MacRae

— Ladyfish (voice)

Paul Frees

— Crusty (voice)

Wesley Gale

— Man Staring Into Window (uncredited)

Leon Alton

— Officer at Fleet Admiral's Meeting (uncredited)

Phil Arnold

— Short Fisherman (uncredited)

George Bruggeman

— Nazi Officer (uncredited)

Paul Busch

— Sonar Man (uncredited)

Al Checco

— Sailor (uncredited)

Cordy Clark

— Giggling Girl (uncredited)

Roydon Clark

— Sailor (uncredited)

Sayre Dearing

— Passerby/Naval Officer at Meeting (uncredited)

George DeNormand

— Nazi Officer (uncredited)

Dan Dowling

— Naval Officer at Meeting (uncredited)

Harold Dyrenforth

— U-Boat Captain (uncredited)

Louie Elias

— Sailor (uncredited)

Lisabeth Field

— Miss Barnes (uncredited)

Logan Field

— Lieutenant (uncredited)

Fred Fisher

— Officer at Fleet Admiral's Meeting (uncredited)

Walter Friedel

— Nazi Officer (uncredited)

George Golden

— Naval Officer at Fleet Admiral Meeting (uncredited)

Marv Goux

— Nazi Officer (uncredited)

John Hale

— Sailor (uncredited)

Sam Harris

— Officer at Fleet Admiral's Briefing (uncredited)