The Incredible Mr. Limpet

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

  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)
• 
  Phil Arnold

  Short Fisherman (uncredited)