Directed by Arthur Lubin, (Buck Privates (1941) and Phantom of the Opera (1943)), and based on Theodore Pratt's 1942 book of the same name. This half animated/half live action adventure has a lot of good imagination on display, and while it may look a bit twee and cutesy now, it's still a good film. It has an enjoyable charm, but it is clearly a product of it's time, and proud of it. In September 1941, shy, hen-pecked bookkeeper Henry Limpet (Don Knotts) loves fish, and he wanted to join the Navy, but he is rejected, and his friend George Stickle (Jack Weston) joins up. While wandering round Coney Island, Henry falls into the water, and he finds himself transforming into a fish and has to adjust to his new life. Believing Henry is dead, George marries Henry's wife Bessie (Carole Cook). Meanwhile, under the sea, Henry falls for Ladyfish (Elizabeth MacRae). Then America enters World War 2, and Limpet finds himself being a very useful asset to the Navy, helping them find Nazi submarines, and he brings George in to help out. It's a film which has a good central idea, and while it comes out well on screen and is only just over 90 mins, it somehow feels longer, despite the best efforts of everyone on board. Knotts is a likeable presence, but you leave this film sort of wishing there had been more of Knotts in live action over animation.