Answer
In "The Incredible Mr. Limpet," Don Knotts transforms into a fish. This whimsical comedy follows the story of Henry Limpet, a meek office worker who yearns for adventure. After a chance encounter with a magical sea turtle, Limpet is granted the ability to become a fish and explore the wonders of the ocean. Through his underwater escapades, Limpet discovers his true potential and embarks on a journey of self-discovery.