Ten years after the war for the Mini-Cons and the apparent destruction of Unicron, the mysterious Alpha Q, operating out of the husk of the planet-eater's body, releases energy-eating Terrorcons to attack the Autobots' Cybertron Cities in the Solar system, gathering Energon for Alpha Q's plan. As the Autobots mobilize against the new threat alongside their human allies (including the teenager Kicker), Alpha Q creates Scorponok to lead the Terrorcons and forges a sword from the Spark of former Decepticon leader Megatron (whose corpse lies within Unicron), in order to turn the other Decepticons on Earth to his side. Megatron engineers his own resurrection, however, taking control of Unicron's body and forcing Alpha Q to flee inside Unicron's head, then attacking Ocean City on Earth. Alpha Q recreates Starscream to assassinate Optimus Prime, but Starscream is brainwashed into Megatron's service, all along Scorponok continues to act as Alpha Q's mole within the Decepticons. Meanwhile, as the Autobots begin construction of Energon Towers to protect the Earth, the legendary figure from Cybertron history known as Rodimus makes his reappearance.