While Optimus struggles to survive after Megatron's destruction of the Autobot base.

With the return of a key Decepticon, the Autobots' situation becomes even more dire and a victory for Wheeljack may ultimately lead to defeat.

The Ultimate Autobot Hunter is unleashed on our heroes.

Led by a new member, Team Prime launches a desperate assault on the Decepticon citadel.

The Autobots adjust to new group dynamics within their expanded lineup.

As tension builds within the Wreckers, they find themselves confronted with the return of the Predacon.

Unlikely duos team up, including Acree and Wheeljack, and Agent Fowler and Jack's mom.

Knock Out and Starscream experiment with synthetic energon.

Megatron doubts Predaking and his allegiance after Predaking reveals a secret of his own.

The Autobots capture Soundwave while Megatron decides to resurrect a former plan.

While Optimus faces off with Predaking, Megatron mounts a campaign to form a new alliance with Rachet.

Ratchet finds himself in a series of predicaments as he resumes his experiments on Synthetic Energon.

The fate of Earth hangs in the balance as the Autobots and Decepticons march toward their last stand.