Unicron returns and takes over Megatron's body to have revenge on the Autobots and ultimately destroy Cybertron. The Autobots, Decepticons, Predaking and two new Predacons must team up to protect their plant and destroy their accursed enemy once and for all.
The survival of Optimus Prime is in doubt after Megatron’s destruction of the Autobot base on Earth, while the separated members of Team Prime try to reconnect after being scattered to the wind to prevent detection.
The Autobots search for signs of each other; the Decepticons welcome someone new to their ranks; Wheeljack's win may lead to an Autobot defeat.
The ultimate hunter is unleashed by the Decepticons. Luckily, a new Autobot joins the fray just in time.
Led by a new member, Team Prime wages war against the Decepticon citadel.
The Decepticons launch a new scheme to clone an army of beasts.
Tension builds within the Autobot team as they face the return of the Predacon.
Unlikely duos team up, including Arcee and Wheeljack, and Agent Fowler and Jack's mom.
Knock Out and Starscream experiment with synthetic energon and threaten to take over the Decepticon ship and unleash an old enemy.
Megatron doubts Predacon and its allegiance after Predacon reveals a secret of its own.
Soundwave is captured by the Autobots; Megatron revives an old plan.
Megatron tries to persuade Ratchet while Optimus Prime goes one one with Predaking.
The Autobots try to rescue Ratchet by tracking down the Nemesis.
The Autobots attack the Decepticon warship and Optimus and Megatron face off for a final time while both sides hope to ultimately restore their planet.