Transformers One has arrived in theaters, surprising new and old fans of this legendary franchise. This film is taking fans back to the beginning with new origins for some of your favorite Autobots ...

Transformers One tells the untold origin story of how Optimus Prime and Megatron went from BFFs to sworn enemies, and since it's set in the past, there have been some changes to who's playing them.

Chris Hemsworth and Scarlett Johansson are just two of the stars bringing the protagonists to life in the new installment of the Autobots, which hits theaters on September 20. Check out the soundtrack ...