Corporal Rex was the partner of Sergeant Wilfred, both members of the Lilliputian mounted police force. They went on a mission of espionage in Bluebeards vast apartment where they discovered the fugitive Goldilocks hiding out. But they were discovered, and Rex met his tragic end being impaled on a knife thrown by Bluebeards butler, Hobbes. His last words urged Wilfred to go on without him.