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Coop and the rest of the kids need Kat's help to escape Kat Planet. Will he give it?
When Kat is fired for incompetence the Robo-Kat-Kops that are sent to take him home also capture Coop, Dennis, Fiona, Millie, Lorne, and Harley and take them to the Kat Planet.
Kat controls the mind of Agent Napolitan, but his plan backfires when some squirrels attack him.
Kat thinks the haunted LeBoot Mansion will be the perfect place for an inter-space teleporter.
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.
Kat and Old Lady Munson show up at school where they work together to make Coop's life miserable.
Coop and Fiona have to settle their argument before they can work together to stop Kat in his evil tracks.
Buck Diamond, Animal Protection Officer declares Coop "Bootsville's Most Wanted".
Kat makes himself a high-powered good luck charm, which means bad luck for Coop.
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.
Kat turns Coop into a cave man, hoping his lowered I.Q. will make him easier to outsmart. Now Dennis must change Coop back to human.
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.
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.
Coop and Dennis battle Kat's army of living hairballs.
Kat builds a device that brings an assortment of movie monsters to life.
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.
Coop discovers buried treasure under Old Lady Munson's house.
Coop and Kat fight over the animal's new lightning box generator and end up swapping brains.
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!
Dad orders Coop to spend more quality time with his little sister; Kat builds a telepathy helmet.
Coop's birthday is here, and everyone is coming to his party, and Phoebe is trying to get rid of Fiona so she can have Coop to herself. Meanwhile, Kat is trying to enjoy a virtual picnic in a secluded spot with his girlfriend, but the kids and Coop keep crashing Coop's birthday.
The evil alien hamster Mr. Cheeks comes back to get revenge on his nemesis, Kat.
Old Lady Munson tells Millie creative stories about her adventures in the past.
Old Lady Munson's garden gnomes come to life and mistake Coop as their leader.
Coop searches for the last available bag of the feline's favorite food after the factory that makes it closes down so he can taunt Kat.
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.
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.
Dennis is accidentally knocked into a portal around the world.
Kat becomes obsessed with making the biggest yarn ball ever made, and starts rustling sheep to gather their wool.
Kat is left at a kennel while the Burtonburgers go on vacation.
Dad accidentally swaps an assortment of Kat's weapons to the unwitting residents of Bootsville.
The Kat Kommander's rebellious son runs away to Earth, where he becomes a handful for Kat, and a danger to the human race.
Kat's malfunctioning spybot thinks Coop is its new master, and wants to protect him from Kat.
Growler swallows a Kat device which makes him grow to the size of a T-Rex.
Coop breaks every window in Dennis' house, and is forced to work off his debt by working in Henry's store.
Coop becomes Dennis’ wing-man for a change, as they go in search of the 'sewer-croc-baby'.
Coop tries to undo the Kat invasion, which he brought about by fooling with Kat’s time machine.
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.
Coop and Dennis compete with one another to reduce their carbon footprints.
Kat’s devious magnifier satellite is causing a dangerous heat wave in Bootsville.
Due to an ‘over-loading’ problem on the Kat Nebula, Kat plots to turn Bootsville Beach into a giant litter box.
After taking the fall for one too many of Kat's destructive escapades, Coop decides to let Kat have free rein to cause whatever destruction he wants.
Coop, Millie, and Dad are taken away to a top secret base to be interrogated, after a UFO investigator suspects they are aliens.
Coop and Dennis climb inside Kat's scratching post and discover Kat's alien technology has created an infinity within.
Kat builds a Rat-ray gun, which he plans on using to turn Coop into a rat, but Dad gets zapped instead, so Coop hopes he can change Dad back... If he can catch him first!
Coop tries to stop the destruction of Massive Mart.
When Kat uses his growth ray to bury Bootsville in a catnip jungle, Coop is blamed by the irate Bootsville Gardening Club.
Millie brings home the class hamster, unaware that Mr. Kat hates hamsters.
With Coop out of town, Kat wants to turn water into milk and Dennis comes to the rescue.
Kat's swarm of flea-sized mind control robots hop into the ears of the people of Bootsville and soon they all destroy Coop.
When Millie tickles Mr. Kat's 'tickle spot' he goes into a blissful state that renders him useless as an alien agent and when Kat's empire find out about him they send a robot to destroy Millie.
Coop falls for Old Lady Munson’s niece Fiona, and Kat does everything he can to make Coop look bad.
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Coop's hopes of a normal Christmas are shattered by the fact that Kat is constantly getting him in trouble; it is revealed that Kat really misses his family back at his home planet. Coop and Millie's grandparents are expected to visit for the Christmas, but many troubles cause them to be late.
Both Coop and Kat join a local rocket club and Coop becomes a big star. Unfortunately, Kat plans on using Coop's rocket to destroy a satellite in space.
Kat uses a universal remote control to try and hack into Earth's computer systems.
On Halloween, Coop and Dennis plan on trick or treating... much to Kat's dismay.
After Kat scratches Coop, he believes that he's turning into a were-cat.
After Kat's latest tantrum almost destroys the house, Dad starts his own extreme renovation.
When Kat's listening transmitter becomes lodged in his ear, his hearing becomes super sensitive.
Coop and Dennis join the soccer team but Coop would rather show off than use teamwork.
After Coop uses cat whispering to make Kat into his new best friend, he becomes a pal to all animals.
Kat's been eating too many treats and how he is tipping the scales with rolls of flab!
It's time for the annual Bootsville Days festival celebrating the town's founding. Coop is in a real Battle of the Bugs!
When OLM shows an unusual interest in Coop and Dennis' favourite show, they become equally obsessed with finding out why she likes it.
Kat wants a day off, but Coop and the gang play capture the flag right through to his secret forest oasis.
Kat struggles to perfect a teleporter to transfer Fishy Frisky Bits across space to his home.
The police and Old Lady Munson catch Coop and his friends waking the neighborhood.
Kat overcomes his fear of snow to make sure Coop gets chilly in the Demolition Run tobogganing challenge.
Seeing how freaked out Kat gets by a huge stray dog, Coop adopts it as his pet and bodyguard, but the dog is a lot more responsibility then he thought, especially after Coop's plan backfires, as Kat retrains it to destroy the house.
Coop's April fool's day jokes have the entire town not believing a word he says, so how can Coop stop what seems to be a Kat led UFO invasion when even Dennis assumes it to be Coop's biggest joke yet?
When Kat and Millie embarrass Coop in front of the school by flipping him, he turns to Dennis for martial arts lessons.
Dad comes to school to shadow the kids on Parents' Day.
The Burtonburgers face friends, neighbours, and each other in a local Fishing Derby.
Dennis and Coop's fathers encourage them to revive a neighbourhood tradition, the 'round the block golf challenge.
On a family shopping trip, Kat gets Coop banned from the grocery store.
Coop is determined to have Bootsville win against Timber Lane in a baseball game.
Desperate for a completed science project, Coop borrows one of Kat's weird machines without knowing what it does.
When Millie finds a new school friend exactly like her, she starts to ignore Kat.
Egyptian artifacts at the museum turn out to be high-tech relics from Kat's world.
Coop brings home a carrot suspended in a glass of water for a science project.
Kat takes advantage of Dad turning the House of Swap into a horror fun house by going for real blood.
Dad builds an ice palace and rink in the backyard.
Bootsville's annual parade has a Spaced Out theme this year and Dad wants to advertise the House of Swap with a Flying Saucer float.
Dad competes with Dennis' father as to who's the best camper during a family weekend in the woods. Coop and Dennis use their knowledge of the forest to lead Kat into escalating confrontations with nature.
The only way to convince Dad that Coop's not the one causing all the destruction is for Coop to never leave his father's sight. But this puts Dad and Millie right in the line of fire. Coop's got to keep on his toes if he wants his family to survive.
Coop comes up with a plan to make money for a Captain Blasteroid Helmet by cutting Old Lady Munson's lawn; Kat tries to stop Coop and Dennis by making the grass grow.
Coop has his work cut out for him when he's forced to babysit Kat, Old Lady Munson, and her dog Growler.
Coop discovers a self-help motivational tape in the House of Swap and turns his life around, until Kat uses the tape to remove Coop’s new-found power of perfect positivity. Now it's up to Coop to use the tapes to fight evil Kat with an even more evil Coop!
As Coop prepares for a big test, Kat comes up with multiple ways to distract him from studying, which in the end, Kat ironically helps Coop remember the things he should study thus having a B+ on the test.
When a contest for pets is announced in Bootsville, Coop subscribes Kat because the winner wins a trip around the world. However, Coop regrets this when he realizes he will be taking the trip with Kat if he wins.
When Coop and Kat get glued hand to paw, they are forced to spend the day together. Kat turns out to be a big help in putting together Coop's new Mechanizor Warrior model robot until Coop realizes Kat has programmed it to destroy Coop, but Kat will also be destroyed.
Coop convinces Dad that he's allergic to Kat so Dad will get rid of the pesky feline for good. Kat turns the tables on Coop, convincing Dad that he's allergic to Coop as well!
Kat's new toy mouse hypnotizes the other cats in the neighborhood, and Kat seizes the opportunity to create his own cat army.
Coop finds some magic stuff in Dad's store and uses it to do a magic act to make Kat disappear forever.
Tensions mount when Coop is sick and Kat is none too pleased, and why shall you ask? Because germs irritate Kat's skin.
Coop comes up with a plan to rescue his dad's (possibly his) helicopter from Old Lady Munson.
Coop is determined to find out the truth about Kat when Kat's mysterious X-rays are destroyed.
Coop gets accused of stealing cookies.
Coop and Dennis build a tree fort, where Kat used it to power-up his collar because the tree's fort was very tall, so Kat's climbed it and starting communicating with other "Kats".
After meowing too much, Kat is forced to wear a special collar, but in the end Kat straps the collar onto Coop's foot.
Old Lady Munson lays down the law; Coop is not to set foot into her yard, but Kat makes sure he crosses the line again, again and again.
Coop watches a horror movie, then after, Kat uses flour to make his skin white and scare Coop.
Coop Burtonburger has his first run in with Kat when his little sister brings the feline home.
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Coop makes a Kat-Proof-Suit out of an old washing machine. It seems to work until Kat breaks out the old steam roller.
A dog chases Kat up a tree and Millie sends out an alarm that Kat is stuck in the tree. When Kat does not want to come down, not the fire department, a SWAT team or the Army can get him out of that tree, but Coop knows the way.
Family picture day has Millie and Dad dropping off Kat at the groomers. Kat does not take to being groomed. After finishing off the groomers, it's between Coop and Kat with Dad and Millie walking into the middle of the fight with the result being a hair-raising picture.
A trip to the zoo has Kat trying to make time with a lady lion only to have the King of the Beast set off a fight beween the other animals and Kat with Kat taking the loosing end all the way.
As Millie and Phoebe play make over, Kat begins using a laser pointer in his finger to tease Honeyfluff and uses that to begin a fight with Coop. It's Kid vs Kat vs Cat.
Coop goes into Kat's brain to mess with Kat's dreams to make them his worst nightmare, but it's a big nightmare for Coop.
Coop discovers that Kat has shed his skin, leaving catnipian termites, after broken by Coop.
Millie heads for the nursing home with Coop and Kat with the idea that Kat can be a companion cat. Kat seems to be taking it well until Coop tries to break it up and head for home, and the house-raising battle begins.
As Kat joins a bunch of wailing cats, Coop mistakes it for a signal of an alien invasion and sets out to wake up the entire town in alarm. It's a musical interruption at the end by Old Lady Munson that really alarms the citizens.
Lorne and Harley rock out with a 'Catboy' music video featuring the battles between Coop and Kat.
Lorne and Harley oversleep and miss the school bus and have quite the adventure catching up to it only to find out that it's Saturday.
Dad offers Coop a chance at a passage to manhood. Kat finds that this does not meat his approval and a fight is on. Can Coop pass the mustard?
Kat tries to attack some birds in a feeder and a squirrell scares them off. Kat knocks the squirrell off the feeder and drop-kicks it out of the yard. A short time later Kat's being hit by an acorn everywhere he goes. A chase of a squirrel winds up back in the yard and Kat learns that squirrels stick together.
Hockey Practice is interrupted by a classic Coop vs Kat on the ice
A day at the pool finds Kat placing some super-bouncing gook on the diving board as Coop prepares to dazzle his friend with a really high dive that ends of leaving Old Lady Munson without her favorite soap-opera and Kat high-and-wet.
Cat subsitutes Coop's soccer ball for one with a built-in time bomb. Coop and Dennis run off trying to find a place to drop the ball to explode. No matter where they go they keep finding reasons the ball can't go there. Kicking the ball between them in panic, the ball winds up next to Kat. And the exploding ball scores!
Coop's family dinner out at the local pasta place is interrupted by Kat who has been smuggled in by Millie and the fight is on.
Coop and Dennis are at the movie theatre enjoying a 3D movie. Kat plants a cell phone on Coop and calls it bothering the entire theatre. Coop heads for the lobby to clean up where Kat starts the attack. In the end there's a real-to-life looking 3D fight on-stage.
Coop begins working on his paddleball record and finally annoys Kat who begins to try and wreck his plans.
Kat's napping is interruped by a little bumblebee and the fight is on.
Kat gets a taste and the new and improved Fishy Frisky Bits Cat Food and seems to enjoy it a bit too much.
Coop hits a ball into Phoebe's house and has to retrieve it. He's followed in by Kat who at first trys to mess things up for Coop but has problems of his own by the name of Honeyfluff.
Back to School shopping with the family and Kat finds a chance to make things really ruff for Coop who's found a toy he really wants.
Coop's at the denist's office where Kat distracts the denist and trys some surgery of his own. Coop frees himself and the fight is on with the office being the loosing end.
Lorne and Harley are filming a 'Catboy Update' film and allow Kat to take possion of a leaf-blower and it's a fight to the finish into Old Lady Munson's yard.
The daily battle between Coop and Kat end up in the bathtub and the fight continues ending in the bathroom flood of floods.
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