Optimus Prime is the leader of the Autobots in their war with the evil Decepticons. Prime is a noble robot that transforms into a semi-truck. Optimus believes that freedom is the right of all sentient beings.

source: CBM FightClub, Marvel.wikia, DC.wikia, Comicvine,com
Optimus' vehicle mode is usually a semi-truck, but he has also taken the form of a firetruck. He has been known to combine with his trailer or other Autobots to become a super-powerful transformer. In the movie he briefly took the parts of Jetfire to become more powerful. His powers vary, but generally are:

Flight at vast supersonic speeds

Invulnerability to the point of spending days in hyperspace. Also able to enter the Earth's atmosphere with ease.

Takes the form of a semi truck

Has a power pack in the form of a trailer to his truck

Can incorporate nearby machines into his body

Can fire bullets from his hand like machine guns

Can fire small rockets

Can summon either an energy axe or an energy enhanced sword from his right arm. In some version, he has a sword from each arm.

Superhuman strength to the point of punching Megatron to submission despite Megatron being made up of advanced parts including a Cybertronian tank.

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