"Moosebumps!: Chapter One," the 10th episode of the 2018 DreamWorks The Adventures of Rocky and Bullwinkle reboot, follows the duo as they purchase a haunted English mansion to hunt monsters, inspired by internet celebrities. Boris and Natasha attempt to thwart them on behalf of Fearless Leader, but Bullwinkle ultimately transforms into a monster after drinking a secret serum. Find episode details and cast information on IMDb . "The Adventures of Rocky and Bullwinkle" Moosebumps! - IMDb