When the local policeman warns Heathcliff that any more of his pranks will land him in jail for life, our little monster decides he'd better reform. And when a new cat gang moves into town to terrorize the neighborhood, Heathcliff is forced to stand passively by and let them take over his territory. But it isn't long before the policeman is back knocking on Heathcliff's door; only this time he's come to ask Heathcliff's help. Heathcliff can do anything he wants, just as long as he runs those nasty new cats out of Westfinster! Things return to normal in no time as Heathcliff shows the punks who's really the boss!

The Catillac Cats are practicing for a band competition at the Cat's Pajamas Club, when three hip cats steal their musical instruments. Riff Raff and Cleo help track down the crooked cats and retrieve the instruments. That night at the contest, the Catillac Cats win first place.

Heathcliff accompanies the Nutmegs to the lake Plastered ski resort where he immediately has a tumble with Alpine, the resident St. Bernard. The ensuing fight takes us throughout the ski lodge and onto the slopes; from hot tub to snowmobile before Heathcliff proves himself the better beast.

After sneaking into a rich cat's condominium, Cleo convinces Riff Raff and the gang to build a condo of their own in the junkyard... But they soon realize that being home owners isn't as easy as it seems.

A big, muscle-bound cat named Pecs tries to take Sonja away from Heathcliff, so he starts working out in order to beat Pecs at his own weightlifting game. Unfortunately, the manager of the gym is in cahoots with Pecs, and throws Heathcliff every possible curve. Heathcliff catches on, and throws the curves right back. Sonja is his in the end.

Riff Raff sees a picture of a cat that looks like Mungo in the paper for which a reward is offered. The cats turn Mungo in and collect the reward, only to find they have left their friend in the clutches of a mad scientist. A rescue plan saves Mungo just in the nick of time.

A mild-mannered cat named Henry -- who looks exactly like Heathcliff -- wanders into the neighborhood. When Spike thinks he has beaten up Heathcliff, Heathcliff catches on and joins forces with Henry to make Spike look like a fool.

Riff Raff and the Catillac Cats go camping in the woods and meet Big Foot who threatens their camp. They try to catch him for fame and fortune. In the end Big Foot gets away, but upon overhearing the boys tell their disappointment over their loss of fame, Big Foot comes out of the woods and auditions for them.

Marcy gets a new cat, Tammy, who challenges Heathcliff's position as top cat in the neighborhood. It's a terrible blow to Heathcliff's ego to have a female cat take over, but neither he nor the alley cats can defeat this lady. Sonja knows how to handle Tammy, however, and puts Heathcliff back in charge.

Mungo's in love with a cute little cat named Dixie and everything is perfect. All except for one thing Dixie's older brother, Jake. Jake has conditions to prove Mungo is worthy of his little sister which include an athletic competition in which Mungo pole vaults, shot puts, runs the high hurdles, and performs other amazing feats all for the sake of a date with Dixie. Mungo's buddies pitch in to help Mungo win, but in the end it is Dixie who has the final say, and she wants Mungo - win or lose!

Heathcliff and Sonja go to the circus to see Heathcliff's cousin, Rollo the cat-clown. Rollo is troubled because the wild circus animals have become tame, the trapeze artists are afraid of heights, etc. Our hero discovers a plot by a rival circus, and with the help of the Catillac Cats, he fails the evil plan.

Riff Raff and the Catillac Cats sneak onto the Space Shuttle in order to carry a home-made satellite into space and focus it toward Westfinster. They get it up and make it home by the skin of their teeth, but the satellite will only send back pictures of the junkyard!!

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 tougher rules will now be enforced. The new dog is the world's worst practical joker and makes our heroes suffer unmercifully until Riff Raff discovers that the new dog can dish it out, but he can't take it.

Heathcliff suffers a nasty bang on the head, which renders the "Devil Cat" side of his personality stunned and permits the "Angel Cat" side to take over. Suddenly Heathcliff is good as gold and begins performing numerous acts of kindness toward Spike. Spike is confused, but certainly willing to take advantage of the situation. He even puts on a show for the other animals to demonstrate his new ability to make Heathcliff do his bidding. However, when the "Devil Cat" recovers, Heathcliff puts Spike back in his place posthaste.

Riff Raff must survive one night in a haunted mansion to win a contest of bravery for Cleo's affections. The Catillac Cats accompany Riff Raff, and are terrorized by all manner of embodied spirits. In the end, however, Riff Raff manages to employ the spooks to frighten away the competition for his love.

Heathcliff declares war on a couple of gophers in the park.

A trip to a rock concert leads Riff Raff, Cleo and the gang in an unlikely direction.

When Iggy is sick, he gets so much special attention from Grandma Nutmeg that Heathcliff pretends to be sick.

Riff Raff "borrows" Leroy's boat for a romantic ride with Cleo.

Mugsy and Spike challenge Iggy and Heathcliff to a soap box racer competition.

Leroy decided that you don't have to be a cat to be an expert at catching mice.

Heathcliff stows away on a cruise ship.

One day, while listening to a radio show, Mungo accidentally hits his head.

The boys at school bet Iggy he cant come up with a better science project than they've got.