This episode is mainly about the big cousin who came to Jerry's house after receiving Jerry's letter for help. Big cousin came to Jerry's house and found Tom bullying Jerry, giving Tom a good lesson. Tom tried to stay healthy and beat his cousin Cai Da, but failed. Also in this episode, the big cousin met the dog boss.

Big cousin Jerry's big cousin can be said to be the strongest mouse among "cats and mice" Dog boss's name is spike. He is a fierce bulldog. Tom always annoys him, so he always beats him.