On Earth, Bumblebee and his team of Autobots--Sideswipe, Strongarm, Grimlock, and Fixit--battle some of Cybertron's most dangerous Decepticons. In the Realm of the Primes, Optimus is training for an important mission. Little do the two friends know, they are both being tested by Liege Maximo, who will stop at nothing to make sure Optimus and Bumblebee destroy each other. Will they be able to defeat their sinister opponent, or will this be the end of the Autobots? The fourth chapter book in an exciting original series! Each book is an original story based on the hit series. Also, includes 2 amazing trading cards! © 2016 Hasbro. All Rights Reserved.