Coop Burtonburger has his first run in with Kat when his little sister brings the feline home.

Coop watches a horror movie, then after, Kat uses flour to make his skin white and scare Coop.

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.

After meowing too much, Kat is forced to wear a special collar, but in the end Kat straps the collar onto Coop's foot.

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".

Coop gets accused of stealing cookies.

Coop is determined to find out the truth about Kat when Kat's mysterious X-rays are destroyed.

Coop comes up with a plan to rescue his dad's (possibly his) helicopter from Old Lady Munson.

Tensions mount when Coop is sick and Kat is none too pleased, and why shall you ask? Because germs irritate Kat's skin.

Coop finds some magic stuff in Dad's store and uses it to do a magic act to make Kat disappear forever.

Kat's new toy mouse hypnotizes the other cats in the neighborhood, and Kat seizes the opportunity to create his own cat army.

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!

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.

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.

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.

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!

Coop falls for Old Lady Munson’s niece Fiona, and Kat does everything he can to make Coop look bad.

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.

Kat's swarm of flea-sized mind control robots hop into the ears of the people of Bootsville and soon they all destroy Coop.

With Coop out of town, Kat wants to turn water into milk and Dennis comes to the rescue.

Millie brings home the class hamster, unaware that Mr. Kat hates hamsters.

When Kat uses his growth ray to bury Bootsville in a catnip jungle, Coop is blamed by the irate Bootsville Gardening Club.

Coop tries to stop the destruction of Massive Mart.

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 and Dennis climb inside Kat's scratching post and discover Kat's alien technology has created an infinity within.

Coop, Millie, and Dad are taken away to a top secret base to be interrogated, after a UFO investigator suspects they are aliens.

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.

Due to an ‘over-loading’ problem on the Kat Nebula, Kat plots to turn Bootsville Beach into a giant litter box.

Kat’s devious magnifier satellite is causing a dangerous heat wave in Bootsville.

Coop and Dennis compete with one another to reduce their carbon footprints.

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 tries to undo the Kat invasion, which he brought about by fooling with Kat’s time machine.

Coop becomes Dennis’ wing-man for a change, as they go in search of the 'sewer-croc-baby'.

Coop breaks every window in Dennis' house, and is forced to work off his debt by working in Henry's store.

Growler swallows a Kat device which makes him grow to the size of a T-Rex.

Kat's malfunctioning spybot thinks Coop is its new master, and wants to protect him from Kat.

The Kat Kommander's rebellious son runs away to Earth, where he becomes a handful for Kat, and a danger to the human race.

Dad accidentally swaps an assortment of Kat's weapons to the unwitting residents of Bootsville.

Kat is left at a kennel while the Burtonburgers go on vacation.

Kat becomes obsessed with making the biggest yarn ball ever made, and starts rustling sheep to gather their wool.

Dennis is accidentally knocked into a portal around the world.