Together, they journey deep into the heart of the planet to put UNICRON to rest once and for all. While the Autobots are skeptical, Optimus Prime realizes it's the only way to save his human friends, including the teenaged Jack Darby.

Megatron, angry that UNICRON finds him unworthy, offers up a truce to the Autobots in order to defeat UNICRON and save humankind. Optimus has reached his breaking point with Megatron and must face him for a rematch of their first battle royale. The Autobots, led by the honorable Optimus Prime, are taking care of their human friend Raphael, who was struck by a bolt of Dark Energon lightning while riding with Bumblebee. Meanwhile, the Dark Energon is spewing from the Earth and causing mass natural catastrophes, including earthquakes, volcanic eruptions, tidal waves, and severe climate change.

However, UNICRON wants nothing to do with Megatron. Megatron, the leader of the Decepticons, has slowly harnessed the power of the Dark Energon, and is ready to claim power with UNICRON. The evil force of UNICRON has awakened deep within the Earth. This DVD takes place at the end of the first season of Transformers Prime.

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