Transformers Prime: One Shall Stand (2012)

The evil force of UNICRON has awakened deep within the Earth. Megatron, the leader of the Decepticons, has slowly harnessed the power of the Dark Energon, and is ready to claim power with UNICRON. However, UNICRON wants nothing to do with Megatron. Will Optimus be able to regain his status as the last of the Primes and return to lead the Autobots with the help of one human teenager?