Professor Ratigan is the main villain from the Disney animated feature "The Great Mouse Detective".
He is a master criminal, the greatest criminal mind of the rodent world. He is a rat, but resents it when anyone mentions it.
In the movie, Basil of Baker Street and Dr. Dawson foil his latest scheme, to replace Her Majesty Queen Mousetoria with a robotic duplicate, and thus control the British Empire, that is, the mouse version of the British Empire.
Ratigan is an elegantDRESSER with gentlemanly manners, but underneath is a fiendish villain who delights in causing pain and humiliation to his enemies, especially Basil. The Professor also plays the harp.
He is the rodent version of Professor Moriarty from the Sherlock Holmes stories.
Ratigan appears as a guest in "House of Mouse" and is one of the Disney villains featured in "House of Villains".