Ten-year-old COOP lives a happy, normal life with his dad and little sister. He does whatever he wants to do and gets along with everyone. Then Coop's spoiled younger sister, MILLIE, falls in love with a stray cat that seems to have come from origin-unknown, and his life quickly turns quite sour. Millie brings the kitty home and much to the boy's displeasure, it seems that KAT has an unnaturally strong detestation for him. What follows is an all-out war between the two; it's clear to Coop that the kitten wants to destroy him, but unfortunately for him, any evidence he has to prove to DAD that the cat is evil is somehow eliminated. And so, it's up to Coop to survive the plans for his demise at the paws of Kat, all while doing everything possible to implicate the feline.