Upon returning to Cybertron, the Autobots use the Omega Lock and Cyber Planet Keys, which awakens the spirit of Primus, the deity who is creator of the Transformers, and Cybertron itself actually transforms into the god's body. After a battle in which Starscream taps the power of Primus and grows to planetary size – only to be defeated by Primus himself – the location of the fourth and final key is determined as Gigantion, the Giant Planet. Gigantion, however, exists in another dimension, having fallen through a rift in space/time, And except for the kids and the minicons, the others can't enter without having their minds separated from their bodies, luckily Red alert has created a vaccine program (based on Technology from Vector prime's sword) to help but it is revealed that Jetfire has Trypanophobia and while the Autobots are able to reach the planet, the Decepticons are led there by the enigmatic Soundwave. Bested by the planet's leader Metroplex, Megatron taps the key's power to become Galvatron, and Sideways and Soundwave reveal themselves to be inhabitants of Planet X, a world destroyed by the Gigantions, upon whom they seek revenge. Galvatron blasts them and Starscream into another dimension and acquires the Lock and Keys for himself, intending to use their power to accelerate the universal degeneration caused by the black hole and remake the cosmos in his own image. Vector Prime sacrifices his life to allow the Autobots to return to their home universe, and the five planet leaders confront Galvatron within the black hole and defeat him. With all the Cyber Planet Keys now in his possession, Primus uses their power to finally seal the black hole, ending its threat.