The Princess in Black, who knows how to handle all kinds of monsters, meets her match in an adorable kitten bent on annihilation and must figure out what her finicky feline friend wants.

While helping her best friend, Danny, film his latest horror flick, Mellie discovers a scraggly cat behind a dumpster outside the YummCo Foods factory. Mellie names the stray Bert and hides him in her room, knowing her parents won't let her keep him. But soon Bert has decapitated all her stuffed animals, and before long he is leaving the headless corpses of birds and mice as gifts for her. Danny is convinced the cat is a zombie, living on the brains...

Anticipating an extra-groovy field day, Pete the cat and his friends Callie, Grumpy Toad, and Gus compete for medals in activities ranging from a water-balloon toss to a three-legged race.

Reluctantly allowing his little sister, a ballet dancer, to join him while trying out a friend's obstacle course, Splat the Cat revises his opinions and considers ballet himself when his sister dominates the course with her strength, speed, and balance.