Planet Cybertron Is in Grave Danger.The Autobots and Decepticons learn that Vector Sigma is producing a new, powerful version of Cybertonium called "Cybertonuron". Galvatron sees this new alloy as a tool to help in finally gaining control over Cybertron, but Zarak believes that the risk is too great, given that there is no guarantee that the Cybertonuron will work, though Galvatron brushes off his concerns. An attack on Cybertron spearheaded by the Predacons causes Rodimus to spring to the planet's defense, calling Kup, Blurr, and Arcee away from the command center on Athenia as a backup unit...