Playful, before he had become the all-knowing, wise Optimus Prime. Toward the end of the film, there's kind of one speech or two where we really lean into the cadence and the vocal quality of what Peter was doing.

Chris Hemsworth reveals that his children played a key role in his decision to voice Young Optimus Prime in "Transformers One."

The highly anticipated "Transformers One" movie tells the story of how Optimus Prime and Megatron went from allies to enemies. Natalie Morales sits down with Chris Hemsworth, who voices a young Optimus Prime,