Nemesis Prime (Transformers Film Series)

"For my world to live, yours must die."

- Optimus/Nemesis Prime, The Last Knight Nemesis Prime is the identity that Optimus Prime takes after being brainwashed by Quintessa, and is a major antagonist of The Last Knight.

History
After Optimus Prime crash landed on Cybertron, He encountered Quintessa, who revealed to him that Earth was in fact Unicron, and ordered him to retrieve her staff, which would drain Unicron's lifeforce, and restore Cybertron. She brainwashed him into becoming her servant, naming him Nemesis Prime, When Optimus' eyes turned purple, he took on the identity of Nemesis, and vowed that no one would stand in his way.

Nemesis Prime arrived back on Earth in the Knights of Iacon's ship and slew two of them before demanding that Viviane Wembly hand over the staff. His former ally Cade Yeager tried to reason with Optimus but Nemesis Prime reasserted his identity and claimed to fight only for Cybertron and its people. Once Viviane had handed over the staff, Santos opened fire on Nemesis, who swatted the TRF aside with his shotgun and exited the ship.

Bumblebee fought with Nemesis atop the ship as it came to the surface. Bumblebee managed to get the better of his former leader, and Cade attempted to persuade him to stop fighting. As the ship rose out of the water, Optimus got the upper hand and prepared to kill Bumblebee, until he managed to talk to Prime with his own voice. Hearing Bumblebee's voice after so long shocked Optimus back to his senses, and he shook off Quntessa's programming. Optimus was left horribly guilty for his actions, and was nearly killed by the surviving Knights, which he was willing to accept, until his friends talked them out of it.