
After another prank of mice, a doctor came to Leopold. The doctor appointed the cat "Furiosin" to help him cope with mice. But Leopold, instead of taking the drug on prescription, drank everything at once and became furious.
Leopold caught the Goldfish, but did not ask for anything from her. Later, the mouse was caught in the fish, and asked to make them big and scary - but in what beast would not turn their fish, they found only problems. Then they ask to turn them back into mice and they find themselves at Leopold's house.