Stooge Villa and Mumbles are trying to invent a new super gas that will render their victims completely helpless. With such a gas, the pair can commit their crimes without any interference from Dick Tracy and his police detective squad. Tracy sends Hemlock Holmes and the Retouchables to stop the two thugs. Stooge and Mumbles decide that it's time to test their new super gas on the cops. They fire their tear gas, only to find out that the formula for super tear gas is nothing more than a recipe for onion soup. Hemlock and his men capture the pair and turn them over to Dick Tracy.