- "Before the beginning, there was Primus and there was Unicron. One, the incarnation of creation; the other, of destruction. For eons, Primus and Unicron battled. The balance of power shifting between them more times than could be counted. Only by creating the Thirteen, the original Primes who preceded me, was Primus finally able to defeat Unicron and cast him out. Primus became one with the very core of our planet, creating life through the Well of All Sparks, while Unicron was never to be heard from again... until now."
- ―Optimus Prime [src]
History[]
Billions of years ago, Primus and his evil twin brother Unicron fought an evenly matched battle for supremacy. In order to best his nemesis, Primus created the Thirteen, and together they managed to defeat Unicron, who was in his weakened state and left to drift throughout the galaxy. Primus then merged with the already-existent Cybertron's core and lay dormant for many millions of years. One Shall Rise, Part 1 As Cybertron entered and continued a civil war, the battle's began to poison the planet's core in turn infecting Primus. Luckily Orion Pax arrived to help clear the core of its affliction. Primus, sensing Orion's pure spark, bestowed upon him the Matrix of Leadership, containing the essence of the Thirteen original Primes, turning Orion into Optimus Prime. One Shall Rise, Part 3
A Decepticon brute thanked Primus that Megatron was still functional, seconds before he was killed by Omega Supreme. An Autobot soldier later yells "Thank Primus you're here!" at Optimus' arrival before being smashed by a brute. Optimus Prime also thanked Primus for the apparent victory over Trypticon, moments before the giant rose again.