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.

Mice received a card by mail, on which a treasure is indicated. In the place indicated on the map, the chest was actually buried, but it was not what the mouse was waiting for.

Leopold bought a TV, and the mice try their best to prevent him from quietly watching his favorite movie.

Leopold makes a bike tour on the country road, and the mice try to arrange an accident for him.

Cat Leopold is preparing to celebrate his birthday, and the mice are trying to spoil his holiday.

Cat Leopold goes to the dacha where the mice are preparing him new mischief.

The cat Leopold sunbaths and bathes, and the mice try to scare him. When he falls asleep on the beach, he dreams that he was on an uninhabited island.

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Cat Leopold goes to the clinic for a physical examination, and the mice try to adjust to him another mischief.

Leopold built a car, equipped with a variety of electronic devices. When Leopold drove out of town, the mice hijacked the car, but could not figure out all of its functions.