While the Autobots continue their battle at the Earth's core, Jack learns more about Optimus' history on Cybertron.
The Autobots team up with a surprising ally to save Earth.
The Autobots discover that Dark Energon is responsible for Earth's recent natural disasters.
When the Autobots learn of the Decepticons' plans to build a Space Bridge, Optimus decides to face Megatron once and for all.
Ratchet's devotion to the Autobots is tested when he believes that he has perfected the formula for synthetic Energon. But when Ratchet uses himself as the test subject, the synthetic Energon begins to alter his personality.
The Autobots and Decepticons race to claim a magnetic weapon. In the ensuing battle, the Bots are forced to fight while stuck together!
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