Our first look at "Transformers One" is here. The film, the first-ever fully CG-animated Transformers movie, debuted in space Thursday yesterday morning before dropping online. "Before he was Optimus Prime, he was Orion Pax. Before he was Megatron, he was D-16," onscreen text reads. "Every transformer has an origin." "Transformers One" is billed as "the untold origin story of Optimus Prime and Megatron, better known as sworn enemies, but once were friends bonded like brothers who changed the fate of Cybertron forever," according to a synopsis. The movie features a stacked voice cast led by Chris Hemsworth as Orion Pax and "Eternals" actor Brian Tyree Henry as D-16. Also featured are Scarlett Johansson, Keegan-Michael Key, Steve Buscemi, Laurence Fishburne and Jon Hamm. "Transformers One" hits theaters Sept. 20.