Author: Gallagher, John
Interest age: from c 5 years 
Published 13/03/2025 by Penguin Random House Children's UK (Puffin) in the United Kingdom as part of the Max Meow series 
Paperback | 224 pages
Kittyopolis is in chaos! Pancakes are turning monstrous and FLIPPING out. Mindy’s inventing in her sleep! And a bunch of Max’s old foes are organizing themselves into a Legion of Nasty to put our favorite feline on PERMANENT PAWSE.
Luckily, Max’s pal Rex Rocket, Cosmic Weiner Dog, is here to help. But will their combined efforts be enough to clean up such a massive mess?! Will Agent M be able to stay a good guy and resist joining the Legion of Nasty?! Will breakfast ever be the same?! Stay strong, heroes– Kittyopolis needs you more than ever!