Transformers: Energon, known in Japan as , is a Japanese anime series which debuted on January 9, 2004. It is a direct sequel to Transformers: Armada. It is also the first Japanese Transformers show where the Transformers are computer-generated (CG), in a cel-shaded technique similar to the Zoids anime, which was a trend that would continue into the next series, Transformers: Cybertron. In the United States, KidsClick started airing reruns of the show from August 27, 2018 until November 3, 2018. Along with Transformers: Armada and Transformers: Cybertron, Transformers: Energon is a part of a saga in the Transformers series known as the "Unicron Trilogy". In this series, the Transformers' primary gimmicks are the Autobots' ability to combine with partners of the same size, the Decepticons' ability to use powered up forms, and the addition of Energon weapons and stars that can be placed on any Transformer. Mini-Cons, from the previous line, are still present, but all Mini-Con pegs are "dummy" pegs as they do not activate a function on the toy.
Plot
Ten years after the war for the Mini-Cons and the apparent destruction of Unicron, the mysterious Alpha Q (which stands for "Quintesson"), 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 the Decepticon leader Megatron (whose corpse lies within Unicron), later known as Galvatron, 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.
With the activation of Earth's new Energon Grid, shielding it from attack by the Decepticons, the Autobots turn their attention to Unicron. Leaving Earth in the ship, the Miranda II, they locate Unicron's body. Megatron mobilizes the chaos-bringer, and pursues the Autobots through their space bridge, emerging in the vicinity of Cybertron. The Transformers' homeworld riddled with Energon towers, fired, leaving Unicron badly damaged. The Autobots form an alliance with Alpha Q, who is already working with Rodimus and his crew, and learn his origin and his motives for stealing Energon: he seeks to use it to recreate that which Unicron has destroyed. Meanwhile, Megatron's forces attack Cybertron, and the Decepticon criminal Shockblast is inducted into their ranks. In the course of Shockblast's escape from prison, guard Wing Dagger swears revenge for the death of his partner, Padlock, and when an Energon tower collapses on him and Tidal Wave, Megatron reconstructs his minion as Mirage, while Primus recreates Wing Dagger as the mighty Wing Saber, who joins the battle alongside Optimus Prime within Unicron. As the battle rages, Kicker arranges to channel all of Earth's Energon into Unicron's head, which Alpha Q then rams into Unicron's body. The resultant reaction with the negatively charged Energon within the body causes a fissure in reality, through which all the combatants are sucked.