After saving the Earth and Cybertron from the wrath of Unicron and his Herald, Orion Eclipse and Altair Comet have succeeded Optimus Prime and Megatron as the new leaders of the Autobots and Decepticons. Cybertron now has a new golden age, with the Autobots and Decepticons no longer being enemies with each other. However, not everyone is willing to let go of the hate as Starscream, Steeljaw, and a few enemies both old and new appear to start a second civil war and destroy the unity between Autobots and Decepticons while seeking revenge on our heroes. When Optimus Prime returns from the Allspark, Hivemus Prime gets to have his own team while defending the innocent. But while the Autobots and Decepticons are working to prevent a second Great War from ever happening, a greater evil known as The Fallen plans his return to bring doom to the galaxy.

Five years after Optimus Prime and the Autobots have defeated Unicron and rebuilt Cybertron, a new war begins on Cybertron as the new leader of the Decepticons has plotted to free Unicron while somewhere on Earth, a missing member of the Decepticons named, Orion Eclipse, seeks to restore his memories. But will he be the one who will help the Autobots and light their darkest hour?