A young man invents a robot dog that has super strength, x-ray vision and can detect crimes being committed. A greedy businessman tries to steal the boy's invention from him.

Tom Cat is a concert pianist who plays beautifully until he is interrupted by Jerry Mouse.

The Bide A Wee Mouse Home has sent the orphan mouse Nibbles to spend Thanksgiving with Jerry. Unfortunately, Nibbles is always hungry.

During yet another pursuit of Jerry, Tom ends up being killed when an upright piano slides down the stairs and slams into him. He meets a feline St. Peter at the gate of the Heavenly Express, but is initially turned away due to his constant torture. However, he will be allowed onto the train if he can have Jerry sign a letter of forgiveness within one hour. If not, it's Hell for Tom. Will he go up or down?