When zombies take over Phoenix, Arizona, Zack Clarke, his best friend Rice, and his older sister's mean friend Madison Miller team up to try to defeat the undead, or at least survive one another.
"Officially adopted by 9-year-old Mellie Gore after escaping from YummCo Laboratories, ZomBert must play along with Mellie's plan to enter him into the Best Pet contest while plotting his revenge"--
9-year-old Mellie Gore rescues Bert the cat from behind the YummCo Foods factory, and Mellie soon wonders if the mystery surrounding Bert's behavior is connected to the powerful YummCo Foods company or could he truly be a zombie?