Henry Limpet

Don Knotts

Bessie Limpet

Carole Cook

Lt. George Stickle

Jack Weston

Harlock

Andrew Duggan

Adm. Spewter

Larry Keating

Fleet Admiral

Charles Meredith

Nazi Admiral (as Oscar Beregi)

Oscar Beregi Jr.

Ladyfish (voice)

Elizabeth MacRae

Crusty

Paul H. Frees

Man Staring Into Window (uncredited)

Wesley Gale

Officer at Fleet Admiral's Meeting (uncredited)

Leon Alton

Short Fisherman (uncredited)

Phil Arnold

Nazi Officer (uncredited)

George Bruggeman

Sonar Man (uncredited)

Paul Busch

Sailor (uncredited)

Al Checco

Giggling Girl (uncredited)

Cordy Clark

Sailor (uncredited)

Roydon Clark

Passerby/Naval Officer at Meeting (uncredited)

Sayre Dearing

Nazi Officer (uncredited)

George DeNormand

Naval Officer at Meeting (uncredited)

Dan Dowling

U-Boat Captain (uncredited)

Harold Dyrenforth

Sailor (uncredited)

Louie Elias

Miss Barnes (uncredited)

Lisabeth Field

Lieutenant (uncredited)

Logan Field

Officer at Fleet Admiral's Meeting (uncredited)

Fred Fisher

Nazi Officer (uncredited)

Walter Friedel

Naval Officer at Fleet Admiral Meeting (uncredited)

George Golden

Officer at Fleet Admiral's Briefing (uncredited)

Sam Harris

Scientist (uncredited)

George Holmes

Officer at Fleet Admiral's Briefing (uncredited)

Joseph La Cava

Naval Officer at Meeting (uncredited)

Mike Lally

Officer at Fleet Admiral's Briefing (uncredited)

Harold Miller

Boat Captain (uncredited)

Charles Morton

Sailor (uncredited)

Henry Norell

Sport Fishmern (uncredited)

Jack Pepper

Passerby (uncredited)

Waclaw Rekwart

Old Man in Shipping Office (uncredited)

Scott Seaton

Sailor (uncredited)

Jack Shea

Policeman (uncredited)

John Truax

Scientist (uncredited)

Feridun Çölgeçen

Lieutenant (uncredited)

Peter Adams