Who played the title character in the 1964 movie "The Incredible Mr. Limpet"?

"The Incredible Mr. Limpet" is a 1964 American live-action/animated adventure film from Warner Bros based on the 1942 novel, "Mr. Limpet" by Theodore Pratt. It is about a man named Henry Limpet who turns into a talking fish resembling a tilefish and helps the U.S. Navy locate and destroy Nazi submarines.

Don Knotts plays the title character. The live action was directed by Arthur Lubin, while the animation was directed by Bill Tytla, Robert McKimson, Hawley Pratt, and Gerry Chiniquy. Music includes songs by Sammy Fain, in collaboration with Harold Adamson, including "I Wish I Were a Fish," "Be Careful How You Wish," and "Deep Rapture."

Jesse Donald Knotts (July 21, 1924 – February 24, 2006) was an American actor and comedian, best known as "Deputy Sheriff Barney Fife" on "The Andy Griffith Show", a 1960s sitcom for which he earned five Emmy Awards. He also starred in multiple comedic films, including playing "Luther Heggs" in "The Ghost and Mr. Chicken" (1966) and "Henry Limpet" in "The Incredible Mr. Limpet" (1964). He also portrayed landlord "Ralph Furley" on the sitcom "Three's Company". In 1979 TV Guide ranked him #27 on its 50 Greatest TV Stars of All Time list.