While the Autobots are trying to investigate planet Zarak, the Andes Mountains in Chile begin exhibiting strange seismic activities, leading to an eruption that threatens a local village. The Trainbots and Protectobots are dispatched to help out the civilians, and the former form Raiden in order to deal with the Predacons, who ambush them and form Predaking. The Protectobots go on ahead only to encounter the Decepticon Headmasters, and form Defensor only to be paralyzed by Mindwipe's weapon. Unable to risk leaving Autobot City unguarded, Ultra Magnus contacts Athenia, and Cerebros dispatches Chromedome and his team-accompanied by Wheelie and Daniel-to aid the beleaguered villagers and Raiden...