Optimus Prime
In the films, Optimus does not have his original Generation 1 look or voice due to the fact they were not based on the cartoon series. In Transformers (2007), Revenge of the Fallen and Dark of the Moon, he had his original body, the one from the 2007 film. In Age of Extinction, Optimus appears battle damaged but was revealed to have been hiding from humans with the other Autobots, according to his friend Ratchet. In the movie, he was given a new look after being fixed by a human named Cade Yeager. In The Last Knight, Optimus is seen floating around in space after running low on Energon, a source of energy that transformers run on. When he appears on Cybertron, Optimus had no memory of what had happened to Cybertron, which had imploded on itself in Transformers: Dark of the Moon. In the film, Optimus is brainwashed by Quintessa, the prime of life and turned into Nemesis Prime. He also has the look he had in Transformers: Age of Extinction.