The story begins September 1941 just before the attack on Pearl Harbor. Shy bookkeeper Henry Limpet loves fish with a passion. When his friend George Stickle enlists in the United States Navy, Limpet attempts to enlist as well, but is rejected. Feeling downcast, he wanders down to a pier near Coney Island and accidentally falls into the water. Inexplicably, he finds he has turned into a fish. Since he never resurfaces, his wife, Bessie, and George assume he has drowned.
The fish Limpet, complete with his signature pince-nez spectacles, discovers a new-found ability during some of his initial misadventures, a powerful underwater roar, his "thrum". He falls in love with a female fish he names Ladyfish, the concept of names being unknown to her, and makes friends with a misanthropic hermit crab named Crusty.
Still determined to help the Navy, Limpet finds a convoy and requests to see George. With George's help, Limpet gets himself commissioned by the Navy, complete with advancing rank and a salary, which he sends to Bessie. He helps the Navy locate Nazi U-boats by signaling with his "thrum", and plays a large part in the Allied victory in the Battle of the Atlantic. In his final mission, he is nearly killed when the Nazis develop a "thrum" seeking torpedo, and is further handicapped by the loss of his spectacles. He manages to survive using Crusty as his "navigator", and sinks a number of U-boats by redirecting the torpedoes. After the battle, he swims to Coney Island to say goodbye to Bessie (who has now fallen in love with George) and gets a replacement set of glasses. He then swims off with Ladyfish.
In the film's coda, set in the modern times of 1964, George (now a high ranking naval officer) and the Admiral are presented with a report that Mr. Limpet is still alive and working with porpoises. The two men travel out to sea to contact Mr. Limpet and offer him a commission in the United States Navy. It is unknown what became of the conversation, for the movie ends with a question mark.Don Knotts as Henry Limpet
Carole Cook as Bessie Limpet
Jack Weston as Machinist's Mate 2nd Class (PO2) George Stickle
Andrew Duggan as Harlock
Larry Keating as Admiral P.P. Spewter
Oscar Beregi, Jr. as Nazi admiral
Charles Meredith as Fleet Admiral
Elizabeth MacRae as Ladyfish (voice)
Paul Frees as Crusty (voice)
This was the last film of Larry Keating and Charles Meredith. Both Keating and Meredith died not long after it was finished.
The film had its premiere on January 20, 1964 at the Weeki Watchee Underwater Theater in Spring Hill, Florida. It was the world's first underwater movie premiere. The film went into general release on March 28, 1964.
The film had its television premiere on CBS on December 29, 1968, as part of The CBS Friday Night Movies.
The Incredible Mr. Limpet was released by Warner Home Video on VHS in 1990. It has since seen three additional VHS releases. On December 3, 1994, the film was reprinted on VHS. On October 1, 2002, it was released on DVD. On August 7, 2012, Warner Home Video released the film in high definition on Blu-ray Disc.
The project entered development in 1996 when Steve Rudnick and Leo Benvenuti were hired as writers for a remake of The Incredible Mr. Limpet. By 1997, Jim Carrey entered negotiations to star in the title role, and was confirmed in February 1998 with Steve Oedekerk hired as the writer and director. Knotts was aware of plans for the remake, which he wrote about in his autobiography, and offered his support. Roughly $10 million was spent on animation tests to digitally map Carrey's motion-captured human face onto a fish's body, which produced disastrous results. By March 1999, Oedekerk left the project following creative differences, while Carrey followed suit in July. In April 2000, Warner Bros. hired Beavis and Butt-head creator Mike Judge as director and co-writer, with Robin Williams, Chris Rock, Mike Myers, and Adam Sandler in consideration for the lead role. Filming was set to begin early 2001.
In June 2009, it was announced that Enchanted director Kevin Lima was attached to direct. In 2010, it was reported that Zach Galifianakis was in talks of the lead role. In March 2011, Richard Linklater entered negotiations to helm the project, and was announced as the director in January 2014. That same month, Femke Wolting and Tommy Pallotta had begun working on the design and animation on the project while Galifianakis will reportedly play the lead character. On July 8, 2014, it was announced that Jon Hamm, Danny McBride, Sarah Silverman, Kevin Hart, Josh Gad, Keegan-Michael Key, and Jordan Peele entered talks for various roles in the film. On August 4, Linklater left the project to concentrate on his next film That's What I'm Talking About (released in 2016 as Everybody Wants Some!!).Dell Movie Classic: The Incredible Mr. Limpet (August 1964)