The Incredible Mr. Limpet 1964

Synopsis:

Milquetoast Henry Limpet experiences his fondest wish and is transformed into a fish. As a talking fish he assists the US Navy in hunting German submarines during World War II.

Directed by: Arthur Lubin
Written by: Jameson Brewer & John C. Rose
Runtime: 99 minutes
Critics score:
Tagline: GLUB! The Face That Launched A Thousand Torpedoes!
Cast:
Don Knotts
Don Knotts
Henry Limpet 
Carole Cook
Carole Cook
Bessie Limpet 
Jack Weston
Jack Weston
George Stickel 
Andrew Duggan
Andrew Duggan
Harlock 
Larry Keating
Larry Keating
Admiral P.P. Spewter 
Oscar Beregi Jr.
Oscar Beregi Jr.
Nazi Admiral (as Oscar Beregi)