After capturing Daniel and Arcee and acquiring the Plasma Energy Chamber key, Scorponok and the Decepticons make their way to Cybertron. The Autobots head after them, but Spike and Cerebros stay on Nebulos and come up with a strategy to use a Hive city as a weapon against Scorponok. Meanwhile, the Decepticons and Scorponok begin to threaten Earth and it is up to the Autobots and their allies to stop them.