Directed by Josh Cooley (of Toy Story 4 fame), Transformers One serves as an ambitious origin story for the most iconic characters in the franchise. Unlike the live-action films, this movie is set entirely on the planet Cybertron and explores the relationship between (voiced by Chris Hemsworth) and D-16 (voiced by Brian Tyree Henry) before they became the legendary enemies known as Optimus Prime and Megatron .