Mister Cat is the 27th episode of Season 4. Oggy is taking part of a Mister Cat contest, but then Bob also enters with his new pet cat. When it comes to the final round, Bob decides to ask help from the cockroaches to fix the contest to make sure his pet cat wins.
Jack, Olivia and Oggy are walking around when Jack saw a poster for the Mister Cat contest. Then Oggy tries to show off his muscles, but all he got was a bump from each of his fingers. Jack and Olivia laugh at Oggy, and they walk to the Mister Cat contest along with Oggy. Bob shows up in the contest, but Jack says that dogs are not allowed. However, Bob has a surprise: his cute adorable pet cat. Jack thinks that Bob would win, so Jack tries to sign up for the contest, but the woman thinks he is a ferocious lion and says that only cats are allowed. Jack attempts to prove the woman he is definitely a cat but gets booed by Bob that he and Muscle Cat laugh at him. The woman suggests to Jack Oggy should participate to win the contest and Jack agrees. Then when it starts, the 4 best cats are chosen: Muscle Cat, and Oggy. Bob then has to find the cockroaches and then asks them for their help. He tells them that if they get rid of every cat in the show in order, except for his, he'll give them a payload of money. The roaches accept this offer and make Jake lose in a dancing competition by burning his Afro wig. Then, during a dressing competition, they drop a crab in Muscle Cat's underwear, that the crab claws him that causes him to fly up into the sky and crash into the judges.
Lou and Oggy compete in a muscle competition. Lou shows off big muscles, much to Oggy's surprise. The cockroaches try to make Oggy lose by using a needle to poke his foot. Jack finds the culprits and decides to chase them. They try to hide under Lou's chair, in which Kitten notices them, realizes he has a fear of cockroaches and runs away. Bob is angry at them. Joey just brushes off like he doesn't know what just happened and demands the money. But Bob whacks roaches with the money, and then chases them trying to swat them. Oggy then shows off his finger "muscles" and the judges laugh, then the announcer claims that Oggy wins. Olivia kisses him, causing him to fall down, and the rest of the people in the show laugh, ending the episode.
- The title cards (as posters) from the episodes Fame & Glory and Showtime!, Boxing Fever and Boxing Match, Formula 1 appears here.
- Oggy poster picture almost looked identical to Erni from the Space Goofs Season 2 credits.