What a cat! He is idle, happy, kind – even doesn’t try to catch mice! The mice should have been happy – but no, they can’t stand such a disorder and intrigue against Leopold. But their most ambitious plan is still to be carried out. Leopold’s birthday will come soon – isn’t it a reason to get into mischief? A merry story about eternal antagonism between cats and mice ends by conciliation and at the end we hear the most wonderful words: “Guys, let’s stay friends!”