Mum and Dad take the TV away until the kids learn to behave, and the siblings realise they need some rules. Mouse is the judge and decides how to settle family arguments, putting wrongdoers into a homemade jail. However, when Mouse also behaves badly, he puts himself in jail and the family realise they are all locked in!

When Mouse accidentally saves Cheese's life from a toppling tree, a grateful Cheese becomes determined to thank him by doing everything she can for him. But Cheese is soon bothering Mouse all the time and her endless caring is becoming too much, causing Boy and Girl to hatch a plan to even things out.