Young Bart Collins enters into a surreal dream world were he and his mother are under the rule of the evil Dr. Terwilliker. Dr. Terwilliker has imprisoned all non-piano musicians. He has also hypnotized his mother into marrying him and plans on forced other boys to play a huge piano that requires 499 other boys to play. Bart and the plumber Mr. Zabladowski must try to stop Dr. Terwilliker.

    Director by Roy Rowland.

    Written by Dr. Seuss and Allan Scott.