In the "" storyline, Unicron (voiced by John Noble) is the source of Dark Energon, a poisonous and corruptive form of Energon with the ability to revive the dead - albeit in a mindless, zombie-like "Terrorcon" state - also known by the name "the blood of Unicron". Unicron is believed to represent the Anti-Spark (most likely a counterpart of the AllSpark). As Optimus Prime relates, Primus and the original Thirteen Primes defeated Unicron and sent his body beyond Cybertron's orbit. As the Chaos Bringer drifted through space, he attracted space debris around himself that coalesced into Planet Earth, rich with Dark Energon. The gravitational pull of an astrological alignment awakens Unicron from his slumber, as Earth's weather patterns go out of control. Having transcended physical form, Unicron berates Megatron for thinking of being his servant.