Transformers One director Josh Cooley breaks down why the movie's post-credit scene is vital to Megatron's development and the movie's origin story.

Transformers One doesn't just change the history of Optimus Prime and Megatron, it also changes the original meanings of the names Autobots and Decepticons.

Transformers One lays the groundwork for new stories in the franchise with a post credits scene heralding the rise of the Decepticons.

"Transformers One" director Josh Cooley channeled his inner kid for the film's big moments, from old-school cameos to an "awesome" post-credits scene.

Transformers One” is the untold origin story of Optimus Prime and Megatron, better known as sworn enemies, but once were friends, in theaters beginning Sept. 20.