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...

"Something terrible is happening in the skies! Rats are eating the MOON! There's only ONE hero for the job, a bold and fearsome beast bioengineered in a secret lab to be the moon's savior and Earth's last hope! And that hero is . . . a cat. A cat who will be blasted into space! Accompanied by the imperious Moon Queen and LOZ 4000, a toenail clipping robot, the First Cat in Space journeys across a fantastic lunar landscape in a quest to save the world....