In this amusing fantasy, a combination of live-action and animated effects, Don Knotts plays scrawny bookkeeper Henry Limpet, who longs to help the U.S. after the outbreak of World War II. He becomes depressed after being turned down by the Navy, particularly after his pal George (Jack Weston) is accepted. When Henry takes a walk on the Coney Island pier with his wife Bessie (Carole Cook), he falls into the water and is transformed into a fish, complete with his reading spectacles. Henry finally gets to help the war effort by helping to track down Nazi U boats for the Navy. Andrew Duggan and Larry Keating play the admirals who spearhead the secret mission involving the transformed Henry. Longtime Disney production associate John Rose was the producer of this film, and the influence of the animation is evident.