Producer Lorenzo di Bonaventura has explained why Marvel actor Chris Hemsworth is taking over as the voice of Autobot leader Optimus Prime from voice acting icon Peter Cullen in the upcoming animated outing, Transformers One. Speaking with Collider, di Bonaventura heaped praise on Hemsworth’s vocal prowess, and revealed why they deemed it necessary for a different actor to voice the younger version of Optimus that will lead Transformers One.