A small brown house mouse who always outsmarts Tom. He is clever, quick, and often enjoys provoking Tom.

Jerry's small, gray, ppy-wearing nephew who is constantly hungry and often reckless.

A tough American Bulldog who often beats up Tom when the cat disturbs him or his son, Tyke.

A grey and white domestic short hair cat who is always chasing Jerry. Though he is the aggressor, he is often the victim of his own traps and Jerry's cunning.