The Mechtogan war had finally ended.But,some Mechtogan who participated in the battle against Mag Mel stayed with their owners.The Original Brawlers thought that there won't be any more battles and wars in which they will be helping but they were wrong.Their friend Shaylinn Izami needs their help!A power-hungry hybrid Bakugan named Neotron decided to take over her planet,Universis and steal the Universis Crystal for immortality.Neotron was supposed to be dead many years ago,before Ero and Shaylinn's birth.He was killed by the father of King Erodius.The Bakugan Battle Brawlers agree to help her and each of them receives a new and powerful Bakugan.Will they be able to defeat Neotron before it's too late?