Original Australian Daybill movie poster. The Great Mouse Detective is a 1986 American animated mystery-comedy film produced by Walt Disney Feature Animation, originally released to movie theaters on July 2, 1986 by Walt Disney Pictures. The 26th feature in the Walt Disney Animated Classics, the film was directed by Burny Mattinson, David Michener, and the team of John Musker and Ron Clements, who later directed Disney's hit films The Little Mermaid and Aladdin. The film was also known as The Adventures of the Great Mouse Detective for its 1992 theatrical re-release and Basil the Great Mouse Detective in some countries. The main characters are all mice and rats living in Victorian London.