In essence, Primus is a divine being who was created at the dawn of time and has been present in every reality since then. He serves as the protector against his evil brother Unicron, and his powers are spread across multiple dimensions. However, when their home planet collapsed into a black hole, Primus' plan to contain Unicron failed, putting not only Cybertron but also the entire multiverse at risk. The Autobots discovered that they could save both their world and the rest of existence by awakening Primus using four special keys inserted into an Omega Lock.