Smart, observant, and all-around-nice-kid named Coop Burtonburger, has a pretty decent set up at home, until his sister, named Millie Burtonburger, brings home a box of pure evil - a tiny hairless cat. the cat's name is Kat or Mr. Kat. This creature of insane malevolence is hell-bent on destroying Coop. The only issue is that it only happens when no one is around to see it! Coop must find a way to prove to the world Kat's evil nature.