Tom, a castle soldier in 16th century France, is assigned to guard the food laid out on a banquet table. Jerry and a smaller mouse companion, two wandering "mouseketeers", make the situation miserable for Tom as they abscond with (and occasionally eat) all the food they can.

Mousketeer Jerry has a love letter to deliver to darling Lilli. He gives it to his young pupil, who has a hard time getting past Tom to deliver it, but he does. They send a few more letters back and forth, at great pain to the youngster.

A young mouse arrives at the Parisian headquarters of the King's Mouseketeers with a letter from his father, François Mouse, asking Jerry to teach the lad to be a Mouseketeer. Lessons begin for the French-speaking boy, but although he's charming, he's hopeless and when he gets into a scrape with Tom, Jerry sends the garçon packing. As the boy is leaving Paris, he hears the noise of fighting, and he returns to find Jerry in a fight for his life with Tom. Champagne corks, a paint brush, and a barrel of wine are props in the lad's attack. But has he lost all his clumsiness?

Jerry and his little French mouse friend are raiding while the king sleeps. They awaken him and he calls for Tom to give him an ultimatum: One more sound from the mice and it's off with Tom's head. The mice hear this and team up to torment Tom.

In this animated comedic short, the entire entourage of a flea circus runs away to join a dog.