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.
Don Knotts
as Henry Limpet
Carole Cook
as Bessie Limpet
Jack Weston
as George Stickel
Andrew Duggan
as Harlock
Larry Keating
as Admiral P.P. Spewter
Oscar Beregi Jr.
as Nazi Admiral (as Oscar Beregi)
Charles Meredith
as Fleet Admiral
Elizabeth MacRae
as Ladyfish (voice)
Paul Frees
as Crusty (voice)
Wesley Gale
as Man Staring Into Window (uncredited)
Peter Adams
as Lieutenant (uncredited)
Leon Alton
as Officer at Fleet Admiral's Meeting (uncredited)
