In "Endgame" 2-parter, Ratchet builds Optimus a jetpack attachment to help in the coming battle against the Decepticons. After some initial difficulty, Optimus is able to get the hang of the device, only to be shot down by Starscream's female clone, Slipstream. Though Ratchet urges Optimus to use the Magnus Hammer, he is reluctant to do so, given his past with Ultra Magnus. In the end, he wields the weapon as the Lugnut-controlled Omega Supreme clones land on Earth. During the fight, Optimus manages to master the Magus Hammer's power in order t overwhelms Megatron to the point of being acknowledged by name. After a devastating battle, the last remaining Omega clones self-destruct due to Starscream's intervention. With Prowl's sacrifice, the Allspark is rebuilt into one as it forms a barrier around the Omega clone, along with Optimus and Megatron. Prowl's spirit pulls Optimus from the bubble just as the clone self-destructs with Megatron still trapped inside. Prime laments Prowl's passing before defeating a heavily damaged Megatron and sparing him the deathblow, saying that Megatron does not deserve the "easy way out". He and his team return to Cybertron with Omega Supreme, the captured Decepticons, and Prowl's body and are greeted as the hero he had wished to be so long ago. The reconstructed Allspark, having a structure similar to the G1 incarnation of the Autobot Matrix of Leadership, is hung around his neck.
Oddly, he had a different plate in those films when in car mode: 900 STRA. In Dark of the Moon, they finally decided to keep his robot and car mode plates consistent. In robot mode in the Dark of the Moon and Revenge of the Fallen video games, he wears 5BBM2. 5LKZ213 was seen in some set photos of robot mode for the first film. Various models for promotional exhibits have featured KDM 0814, FXPERTS, and, of course, BUMBLBE.
Optimus and Bumblebee snuck into the Decepticons' base, and found their enemies upgrading themselves with Autobot parts. The pair took offense to this, and Bumblebee set about sabotaging the process. Megatron wound up tripping on some gumballs thanks to the Autobot's mucking about, and Optimus congratulated his fellow Autobot on a prank well done! Intro!
In the Escalation miniseries, Megatron engages Prime and, boosted by Ore-13, overcomes him. Believing their leader dead, the rest of the Autobots attempt to buy the newly arrived Hot Rod time to collect the clone. Prime, who had transferred his consciousness to a backup memory in his trailer command post, advised them to exploit Ore-13's weakness and assault Megatron all-out, catalyzing the Decepticon leader's Energon supply and crippling him.
Following a battle which left him grievously wounded, Optimus Prime's entire structural integrity and circuitry processors were reprogrammed into a sleeker, stronger, combat-ready configuration. With a new giant laser-targeting rocket launcher, ripple-fire missile blaster and armor-piercing discs, Optimus was ready to immobilize Megatron once and for all.
Originally, Optimus Prime was created as the leader of the Autobots, though it is unknown how he was created or his origins. In a possible future, Megatron was threatened by the existence of the Aerialbots and had Shockwave build a time machine to send them back in time to get rid of them. However, he only ended up changing history for the better. In the revised timeline, Optimus Prime began his life as a robot named Orion Pax, a mostly defenseless dock worker during the Golden Age of Cybertron nine million years ago, with a girlfriend named Ariel and a best friend named Dion. During this time, a new breed of robot with new flight capabilities appeared on the planet that Orion idolized. When Megatron, the leader of the new group of robots, approached him with inquiries about using one of the dock warehouses, Orion was swayed by Megatron. Both Orion and Ariel were severely wounded when Megatron and his forces attacked in order to claim the energy stored there. Searching for someone to help them, the time-displaced Aerialbots took Orion and Ariel to the ancient Autobot, Alpha Trion, who used them as the first subjects for the new reconstruction process he had developed involving rebuilding the frail Autobot frames into more battle-hardy configurations. 
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