A Russian mouse lands in New York in the 1880s, only to be separated from his family. He must now learn to live on the streets and evade the mean cats.
A group of scientists take Simon, a psychology professor, as a test person for a brainwash experiment. After that they try to convince him that he was a living-being from another planet.
Four red plaid traveling cases-- one of each belonging to a befuddled Iowa musicologist, a strange but bright young woman, a rich matron and a suspicious fellow-- are mixed up at a San Francisco hotel, with hilarious results.