Ep 39. Sonja's Nephew / Dr. Mousetus

In order to get a date with Sonja, Heathcliff promises to baby-sit her little nephew, Eggbert, for the day. The precocious kitten runs Heathcliff so ragged, he doesn't have the strength to go out with Sonja that night.Hector and Mungo become the guinea pigs in a mad scientist's experiment that has them changing like Dr. Heckyl and Mr. Nyde. When Riff Raff finds them and discovers that without the aid of his secret cheese formula the scientist is actually only a tiny mouse, r saves his friends by destroying the magic formula and chasing the mouse out of town.