When ten-year old Coop Burtonburger’s spoiled little sister Millie brings home a mysterious stray cat, his idyllic life is turned upside down. Coop soon discovers Kat is more than just a scrawny, purple, hairless pet; he is also a super-smart, conniving mastermind with a fanatical hate for Coop himself. Kat instantly declares war on Coop--to the death; the two fight constantly as Coop tries to stop the Kat and tell the world about his possible plans, only to find Kat destroying the evidence and putting the blame on Coop every time.
Flea Brains: Kat's swarm of flea-sized mind control robots hop into the ears of the people of Bootsville and soon they all want to destroy Coop. Menace the Dennis: With Coop out of town, Kat wants to turn water into milk and Dennis comes to the rescue.
Watch Now:AmazoniTunesAmazing Feet of Strength: Kat soups up Coop’s new soccer shoes to allow the wearer to run faster and jump higher, and Coop wears the shoes in the championship game. Me Coop, You Kat: Kat turns Coop into a cave man, hoping his lowered I.Q. will make him easier to outsmart.
Watch Now:AmazoniTunesHair Brains: Kat coughs up a trio of living hairballs, and he orders them to attack Coop Hot Dog Day: It’s Hot Dog Day, and Coop has the honor of being named Keeper of the Weiner Water. But Kat wants to ruin the most special day of the year.
Watch Now:AmazoniTunesFangs for the Memories: Kat’s memory eraser leads to Coop forgetting Kat is an evil alien, but Dad accidentally gets Coop’s lost memories and suddenly knows the terrible truth. Drive-In Me Crazy: Kat builds a device that brings an assortment of movie monsters to life.
Watch Now:AmazoniTunesMind Games: Dad orders Coop to spend more quality time with his little sister; Kat builds a telepathy helmet. Strange Kat on a Train: Coop goes on a train to buy something from a man named Old Herman, Unfortunately it turns out to be the evil alien hamster, Mr. Cheeks!
Watch Now:AmazoniTunesBoard Kat: Coop and Kat fight over the animal's new lightning box generator and end up swapping brains. The Treasure of Sierra Munson: Coop discovers buried treasure under Old Lady Munson's house. Note: YTV aired this episode as a mistake as it was originally supposed to air on March 5, 2011.
Watch Now:AmazoniTunesKickin Butler: Dennis is accidentally knocked into a portal around the world. You Kat See Me: Kat makes himself invisible and causes trouble for Coop on the night he invites Fiona to dinner and when Dad invites Coop's teacher over for dinner.
Watch Now:AmazoniTunesRebel with a Claw: The Kat Kommander’s rebellious son runs away to Earth, where he becomes a handful for Kat, and a danger to the human race. Swap Wrecked: Dad accidentally swaps an assortment of Kat’s weapons to the unwitting residents of Bootsville.
Watch Now:AmazoniTunesKeep on Rockin: Coop's grandparents visit, so Dad buys them rocking chairs. However, it turns out they are adventure junkies who accept that Kat is an alien. It's in the Bag: Coop searches for the last available bag of the feline's favourite food after the factory that makes it closes down so he can taunt Kat.
Watch Now:iTunesCheeks of Evil: Millie brings home the class hamster, unaware that Mr. Kat hates hamsters. Reap it and Weep: When Kat uses his growth ray to bury Bootsville in a catnip jungle, Coop is blamed by the irate Bootsville Gardening Club.
Watch Now:AmazoniTunesCoop D'Etat: Kat and Old Lady Munson show up at school to torment Coop; Kat wants to steal the satellite from Bootsville's Museum, but Coop must stop Kat from stealing the satellite. The Incredible Shrinking Coop: Kat shrinks Coop and Dennis down to size and tries to squash them like bugs, which makes it hard for Coop to do something big for Dad for Father's Day.
Watch Now:AmazoniTunesYou Scream, I Scream: Coop takes on the teen aged bully who pedals the Curly Swirl Ice Cream cart, and forgets to pay attention to Kat’s latest evil plans. Good Luck Harm: Kat makes himself a high-powered good luck charm, which means bad luck for Coop.
Watch Now:AmazoniTunesHit the Road: Kat is left at a kennel while the Burtonburgers go on vacation. Never Cry Sheep: Kat becomes obsessed with making the biggest yarn ball ever made, and starts rustling sheep to gather their wool.
Watch Now:AmazoniTunesDown the Drain: Coop becomes Dennis’ wing-man for a change, as they go in search of the ‘sewer-croc-baby’. 9 to 5 to Oblivion: Coop breaks every window in Dennis’ house, and is forced to work off his debt by working in Henry’s store.
Watch Now:AmazoniTunesKat to the Future Part 1: Coop uses Kat’s time machine to go back to the past and stop Millie from bringing Kat home, but ends up altering the future for the worse. Kat to the Future Part 2: Coop tries to undo the Kat invasion, which he brought about by fooling with Kat’s time machine. How will Coop undo the Kat invasion, and get back to the present before it's too late?
Watch Now:AmazoniTunesKat Whisperer: Coop learns a new skill that causes him and Kat to become fast friends. Now, he's making friends with all of the neighborhood cats. Bend It Like Burtonburger: After joining the soccer team, Coop begins showing off. But when he needs Dennis' help, will Coop be able to keep his ego in check?
Watch Now:AmazoniTunesStall That Jazz: When Kat's hearing is accidentally enhanced, Coop goes out of his way to create lots of noise. Under Destruction: After Kat destroys the house, Dad begins doing extreme renovations.
Watch Now:AmazoniTunesSuddenly Last Slammer: When the police question everyone about a late night rumbling, their stories are all mismatched. The Kitty Vanishes: Kat discovers that his teleporter can transport people, and madness ensues.
Watch Now:AmazoniTunesCurse of Tutankitty's Tomb: Coop believes that an Egyptian tomb is actually a spaceship that belongs to Kat. Pet Peeved: When Millie's attention is diverted, Coop seizes the opportunity to get Kat out of the house.
Watch Now:AmazoniTunesEpisode Ninja is a small business run by one person.
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