Fan Casting Orion Pax / Optimus Prime in Transformers Begins

Peter Cullen as Orion Pax / Optimus Prime: A concerned Autobot librarian and clerk who proves himself worthy of wielding the legendary Matrix of Leadership and becoming the fourteenth and last Prime. When Ultra Magnus is captured, he assumes temporary (and later permanent) command of the Autobot forces. Cullen reprises his role from previous Transformers media.