In 1987, when Optimus Prime was transported to Cybertron, Ultra Magnus and the Wreckers nearly killed him due to deliberate Decepticon misinformation that claimed he was a masquerading Decepticon agent which was disproved by Emirate Xaaron. Prime and Magnus then fought side-by-side on Cybertron for a period, until Ratbat cleverly deployed the Spacebridge to displace Magnus, Prime, and an insane Megatron to Earth. As Magnus adjusted to his temporary new home, he stumbled across Galvatron, who had returned from the future with a new scheme to harness the power of the Earth's core. Continuing their deeply bitter feud, Galvatron battled Ultra Magnus with help from the future Autobots, but in the end, the two leaders were entombed in volcanic lava.