Heathcliff sneaks into the Van Corkingdale mansion to challenge Bruno, their ferocious guard dog, and determine who the real king of the neighborhood is. Inside, Heathcliff defeats Bruno, allowing burglars to raid the house! Later, when the some crooks attempt to burgle the Nutmeg home, Heathcliff traps them for the police, and returns all the previously stolen goods to the mansion. / Cousin Lucky comes to visit Riff Raff seeking help. It seems...

J.B. is a rich, snobbish cat who comes to visit the Nutmegs. He expects Heathcliff to wait on him paw and paw, and even vies for Sonja's attention. However, Heathcliff discovers the dark secret of J.B.'s past and uses the information to his advantage. / Riff Raff, Cleo, and the Cats visit the world famous "Dizzyland" amusement park where they tour the House of the Future. The cats hide when the house closes for the day, and spend the evening enjoying...

Heathcliff accidentally solves a Rubik’s cube-type puzzle, so Iggy decides his cat must be a genius and submits him to a scientist for laboratory testing. Heathcliff doesn't blend well with the other animals, and in no time has managed to cause countless squabbles and sabotage all the lab tests.

Marcy dresses Heathcliff in baby clothes and is pushing him down the street, when two crooks disguised as mother and child rob a jewelry store. The police confuse the duos and throw Heathcliff in jail! Undaunted, our courageous cat escapes his cell, apprehends the true offenders, and surfaces a hero. / Much to Riff Raff's dismay, his mother is coming to town to see the beautiful mansion he wrote her he lived in. Riff Raff, in a frantic attempt...

Grandpa, Iggy and Heathcliff find themselves in the path of a group of people on horseback. It's a fox hunt, and both Iggy and Heathcliff are very sympathetic to the fox. Heathcliff teaches the frightened creature several tricks to foil the hunt, and saves the little guy's life. / Cleo and Bush are forced to move into the junkyard after a sign goes up at their music store disallowing pets. At first the junkyard cats are excited about the new living...

Mugsy and Spike challenge Iggy and Heathcliff to a soap box racer competition. Iggy builds a great car out of odds and ends Heathcliff gathers from around the neighborhood. The alley cats join in with a junk-racer of their own, and after a fierce contest fraught with conflict and sabotage, Heathcliff stands alone in the winners circle.

When Heathcliff tries to follow Iggy to a Boy Scout camp, the scout master forbids it, saying, "A common house cat could never survive in the wild." This infuriates Iggy's pet, who sneaks along anyway just to prove the scout master wrong. Even though Heathcliff gets into all kinds of mischief in the wilderness, he leads the group to safety when they get lose in the woods, so he becomes the first cat ever to be named "Scout of the Year!" / Riff Raff...

Spike's mother is coming to visit, so he pleads with Heathcliff to let it appear that he runs things around the neighborhood. Spike says he'd be a disgrace to his family if they knew he was second to a cat. Heathcliff refuses on the grounds that he doesn't want his neighborhood misrepresented, and continues to torment Spike at every opportunity. However, Heathcliff quickly learns that he is no match for Spike's mother. / Riff Raff talks Catillac...

Sonja tells Heathcliff he needs to lose a little weight, so he goes on to crash diet with the help of the Alley Cats. Every time Heathcliff weakens and tries to eat something, Mungo or Hector snatch the food away. When Heathcliff is finally able to tell Sonja he has lost ten pounds, she admits he'll love him at any weight, so our hero instantly returns to his former gluttonous ways. / Leroy gets a new assistant dog in the junkyard and announces that...

The Nutmegs tour the fire station and are very embarrassed by Heathcliff's behavior. That night, while sleepwalking, Grandpa Nutmeg sets the house on fire and Heathcliff saves everyone by getting the firemen there in time, thus redeeming himself for the way he'd acted earlier.