During summer vacation, Ginrai takes the train to the Athenia with the Headmaster Juniors and the Godmasters in order to take over the position of Autobot Supreme Commander from Fortress. After handing over the duty to Ginrai, Fortress heads back to Master, leaving Chromedome in charge of Athenia. However, the Decepticons raid Athenia by that night, forcing Autobots to scramble. It is revealed that the Decepticons on Earth have teamed up with those in space. Lightfoot tasks the Headmaster Juniors and Sixknight with the rescue operation. He then joins the battle to back Ginrai up.