Wheelie and Brains

The following is a list of cast members and characters from the Transformers film series and the tie-in video games.

The Autobots are the main protagonists of the Transformers franchise who come from the planet Cybertron.

Optimus Prime (voiced by Peter Cullen) is the main Protagonist of the series, the brave and valiant leader of the Autobots, the last descendant of the Dynasty of Primes and keeper of the Matrix of Leadership. 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 5700XE Phantom semi-truck.

In the first film, Optimus Prime arrives on Earth with Ratchet, Ironhide, and Jazz trying to find the AllSpark. 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. Afterward, Optimus and the other Autobots form an alliance with the humans and work closely with them, with the resulting alliance being called NEST.