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Optimus Prime is an Autobot Transformer from Cybertron who sympathizes with and seems to admire humans. He's voiced by Peter Cullen. Sam Witwicky is a teenage human played by Shia LeBouf. I've always liked their friendship, particularly in the second Transformers film. Sam nearly loses his life in order to save Optimus', and Optimus gives Sam confidence, courage, and strength. Optimus doesn't want any humans on Earth to suffer for the Transformers' mistakes, and Sam helps Optimus with that cause.