"Splash" was released 40 years ago on march 9, 1984. The main cast includes Tom Hanks as Allen Bauer, Daryl Hannah as Madison, John Candy as Freddie Bauer, and Eugene Levy as Dr. Walter Kornbluth. Trivia: 1. "Splash" was Tom Hanks' first leading role in a feature film, helping to launch his successful career in Hollywood. 2. The underwater scenes were famously challenging to film, requiring innovative techniques and special effects for the time. 3. Daryl Hannah's portrayal of Madison the mermaid