Mrs. Brisby's Adventures in The Prince and The Pauper (also known as Mrs. Brisby meets The Prince and The Pauper) is the first film of the Mrs. Brisby's Adventures series.
It follows the adventure when Mrs. Brisby left her home in the forest only to travel to England. There She met Mickey Mouse and his friends who encountered a young prince and his little sister a princess (who are both twins to Mickey and Mrs. Brisby). England was now in danger from Captain Pete and his weasel henchmen. It was up to Mickey and Mrs. Brisby to stop him.