Dirección: Arthur Lubin
Limpet es un aburrido contable cuya pasión son los peces y aspira a servir en la Marina de EEUU. Pero a pesar de que es rechazado, llegará a cumplir su sueño... bajo el agua. Se tira desde el muelle y ante la sorpresa de su esposa, se transforma milagrosamente en una fantástica criatura con aletas. Limpet se convertirá en el arma más secreta de la Segunda Guerra Mundial, detectando patrulleros nazis en las aguas del Atlántico.
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)
