A Disney cartoon based on the children's book series by Eve Titus, Basil of Baker Street; the story of a mouse who lives next door to Sherlock Holmes and is himself a renowned (mouse) detective.
While not up to the lavish production standards of Disney's post-Little Mermaid flicks, it is noteworthy for being one of the first Disney efforts in CGI (the clockwork interior of Big Ben). Of the good cast, the most well-known is the late Vincent Price who naturally played the villain, the notorious Professor Ratigan. (Don't call him a rat!)
This is worth renting for the escape scene (from Ratigan's trap) alone: Smile, everybody!