The Rebirth (3) (S04E03)

With Daniel and Arcee captured and the Plasma Energy Chamber key in their possession, Scorponok and the Decepticons set their sights on Cybertron. The Autobots pursue them, but Spike and Cerebros remain on Nebulos, devising a plan to weaponize a Hive city against Scorponok. Meanwhile, the Decepticons, led by Scorponok, start to pose a serious threat to Earth, leaving the Autobots and their allies to rise to the challenge and thwart their dangerous intentions.