The Great Mouse Detective (released as Basil the Great Mouse Detective in some countries and The Adventures of the Great Mouse Detective during its 1992 re-release) is a 1986 American animated mystery adventure film produced by Walt Disney Feature Animation and released by Walt Disney Pictures. Based on the children's book series Basil of Baker Street by Eve Titus and Paul Galdone, the film is written and directed by John Musker, Dave Michener, Ron Clements, and Burny Mattinson. Featuring the voices of Vincent Price, Barrie Ingham, Val Bettin, Susanne Pollatschek, Candy Candido, Diana Chesney, Eve Brenner, and Alan Young, the plot follows the titular mouse detective, Basil of Baker Street, who undertakes to help a young mouse find and save her father from the criminal mastermind Professor Ratigan.

Plot

In 1897 London, a young mouse Olivia Flaversham celebrates her birthday with her single father, toymaker Mr. Flaversham. A bat with a crippled wing and a peg leg arrives unexpectedly, kidnapping Flaversham. Olivia leaves to find Basil of Baker Street, the famous Great Mouse Detective. David Q. Dawson, a retired army surgeon mouse returning from Afghanistan, meets Olivia and escorts her to Basil's residence.