Heathcliff knows he is the best cat around! Never have we seen such self-confidence topped off with a heavy dose of vanity, cunning, ruthlessness, and a mischievous love of gags. He cruises and struts down the street and watch out any person, cat, or dog who gets in his way! Although he may terrorize the neighborhood, let an outsider try to push anyone around and he is a veritable tiger of defense. On the other side of town are The Catillac Cats, which typically revolve around leader Riff-Raff's get-rich-quick schemes or searches for food.
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!
