Sequel to The Mouse that Roared; The Tiny Country of Grand Fenwick has a hot water problem in the castle. To get the money necessary to put in a new set of plumbing, they request foreign aid from the U.S. for Space Research. The Russians then send aid as well to show that they too are for the internationalization of space. While the grand Duke is dreaming of hot baths, their one scientist is slapping together a rocket. The U.S. and Soviets get wind of the impending launch and try and beat them to the moon.

An Eastern cult discovers that the sacrificial ring is missing. Ringo, drummer of The Beatles band has it; sent by the girl (who's to be sacrificed) as a gift. Clang, Ahme, Bhuta and several cult members leave for London to retrieve the ring. After several failed attempts to steal the ring, they confront him in an Indian restaurant. Ringo learns that if he does not return the ring soon, he will become the next sacrifice. Ringo then discovers that the ring is stuck on his finger. Its a race against time; John, Paul, and George try to protect their friend while they're all being chased not only by Clang and his minions, but also by two mad scientists and the chief inspector of Scotland yard. Will Ringo be saved, or will he be sacrificed?