Primus is the creator-god of the Transformers. An ancient and ethereal being whose origins date back to the beginnings of the universe itself, Primus is a multiversal force for good, his life force existing across multiple realities and infinite alternate universes. In each one, he is the final defense against his fallen sibling, Unicron the Chaos-Bringer.
Primus eventually transformed himself into the planet Cybertron.