There once was a boy called Billy McGill who lived by himself at the top of a hill. He spent every day in his house all alone for Billy McGill liked to be on his own. But life doesn't always turn out how you plan it... One day, Billy hears the squeak of a mouse -- destroying his perfectly peaceful existence. So he gets a cat to catch the mouse. But the cat and the mouse make friends. So he gets a dog to chase the cat. But they all play together too....