Three mice guarding a salami and sausage shop regularly clash with a group of cats. One day, Eye Patch the cat hurls a book at the mice. They discover it is Alexandre Dumas' "Three Musketeers" and after reading it decide to imitate the exploits and adventures of the famous trio. The Mouseketeers and the cats engage in many escapades and capers. But our heroes triumph and good prevails over evil.