The Great Mouse Detective (released as Basil the Great Mouse Detective in some countries and as The Adventures of the Great Mouse Detective for its 1992 American 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, it is the 26th Disney animated feature film. It was written and directed by John Musker, Dave Michener, Ron Clements, and Burny Mattinson in their feature directorial debuts. Featuring the voices of Vincent Price, Barrie Ingham, Val Bettin, Susanne Pollatschek, Candy Candido, Diana Chesney, Eve Brenner, and Alan Young, the film's plot follows Basil of Baker Street, a mouse detective who undertakes to help the young mouse Olivia find and save her father from the criminal mastermind and Basil's sworn enemy, Professor Ratigan.
The Great Mouse Detective draws heavily on the tradition of Sherlock Holmes with a heroic mouse who consciously emulates the detective. Titus named the main character after actor Basil Rathbone, who is best remembered for playing Holmes in film (and whose voice, sampled from a 1966 reading of "The Red-Headed League" was the voice of Holmes in this film, 19 years after his death). Sherlock Holmes also mentions "Basil" as one of his aliases in the Arthur Conan Doyle story "The Adventure of Black Peter".
The Great Mouse Detective was released to theaters on July 2, 1986, to positive reviews from critics and financial success, in sharp contrast to the box office underperformance of Disney's previous animated feature film, The Black Cauldron (1985). The film's timely success has been credited with keeping Walt Disney Animation a going concern after the previous film's failure by renewing upper management's confidence in the department, thus setting the stage for the Disney Renaissance when feature animated films would become the corporation's most lucrative and prestigious product.
Plot
In London in June 1897, a young mouse named Olivia Flaversham is celebrating her birthday with her single father, toymaker Mr. Flaversham. Suddenly, a bat with a crippled wing and a peg leg bursts into the toyshop, kidnapping Flaversham. Olivia leaves to find Basil of Baker Street, the famous Great Mouse Detective, but gets lost. David Q. Dawson, a retired army surgeon mouse newly returned from Afghanistan, meets Olivia and escorts her to Basil's residence. Being busy already, Basil initially dismisses them. Olivia then mentions the bat that abducted her father, and Basil realizes that Olivia saw Fidget, the assistant of Professor Ratigan, the criminal mastermind whom Basil was working to catch. It is then revealed that Ratigan kidnapped Flaversham to create a clockwork robot replica of the Queen of the Mice, so that Ratigan can usurp her place as "Supreme Ruler of all Mousedom". Flaversham initially refuses to participate in the scheme, but capitulates when Ratigan threatens to harm Olivia.
Meanwhile, Fidget appears in Basil's window, then suddenly disappears. Basil, Dawson and Olivia take Toby, Sherlock Holmes' pet Basset Hound, to trail Fidget's scent. They trace Fidget to a human-sized toyshop; while searching the area, Dawson finds Fidget's checklist, and Basil discovers Fidget has been stealing clockwork mechanisms and toy soldiers' uniforms.
Fidget ambushes and kidnaps Olivia before Basil and Dawson can stop him. Basil does some chemical tests to the checklist, discovering it came from the "Rat Trap", a tavern near the junction of the sewer and the Thames. Basil and Dawson disguise themselves as sailors and head to the tavern; they spot Fidget there, and follow him to Ratigan's headquarters, only to be ambushed by Ratigan and his henchmen. Ratigan has the pair tied to a spring-loaded mousetrap connected to a Rube Goldberg machine of various killing devices. Ratigan then sets out for Buckingham Palace, where his henchmen hijack the royal guards' roles and kidnap the Mouse Queen. Inspired by a remark Dawson made, Basil deduces the trap's weakness, freeing himself, Dawson and Olivia.