

Optimus Prime then faces the Fallen and Megatron. Near the end of the film, he is revived by Sam with the Matrix of Leadership and is fused with Jetfire, making him more powerful. In Revenge of the Fallen, Optimus is killed by Megatron during a battle with him, Starscream, and Grindor. Afterward, Optimus and the other Autobots form an alliance with the humans and work closely with them, with the resulting alliance being called NEST. At Mission City, he kills Bonecrusher and battles Megatron, but Sam pushes the AllSpark into Megatron's chest, killing him and destroying the cube as a result, Cybertron can no longer be restored. In the first film, Optimus Prime arrives on Earth with Ratchet, Ironhide, and Jazz trying to find the AllSpark. Optimus Prime transforms into a 1994 red and blue Peterbilt 379 semi-trailer truck in the first three films, a rusty 1973 Marmon HDT-AC 86 semi cab-over truck in the beginning of the fourth film, and later a blue and red 2014 Western Star 5700 OP Phantom semi-truck.

Optimus Prime (voiced by Peter Cullen) is the leader of the Autobots, the last descendant of the Dynasty of Primes and keeper of the Matrix of Leadership.
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See also: Optimus Prime § Transformers film series The Autobots are the main protagonists of the Transformers franchise who come from the planet Cybertron. Further information: Transformers (film series) § Cast Character
