One of the classic versions of the domestic "Tom and Jerry" The little cat Mimi is lazy and loves to eat. One day, while the owner is away on business, Mimi is fast asleep. At that moment, three little mice sneak onto the table, intending to steal the meat filling. Suddenly, they spot a cat sleeping there and flee back home in fright. The mother mouse comes out to take a look and realizes it's just a lazy cat. She jumps forward and grabs the cat's whiskers, causing Mimi to cry out in pain. Mimi tries to fight back but lacks the skills. The mice grow bolder and tie the cat to the electric cord, allowing a group of mice to feast on the meat filling. With tears in his eyes, Mimi regrets being lazy and not learning any skills. From then on, Mimi resolves to correct his mistakes. He learns tree climbing from the squirrel, speed from the white rabbit, and jumping from the tiger, mastering various skills. One day, when the mice come to steal food again, they are taught a good lesson by Mimi...