Chris Hemsworth and Brian Tyree Henry voice two of the most iconic characters in the Transformers universe, Orion Pax and D-16, in the long-awaited, untold origin story of Optimus Prime and Megatron. Better known as sworn enemies, the two bots were once friends bonded like brothers who changed the fate of Cybertron forever. Transformers One, the first-ever fully CG-animated Transformers film, features a star-studded voice cast that also includes Scarlett Johansson, Keegan-Michael Key, Steve Buscemi, Laurence Fishburne, and Jon Hamm.