Three teens from Nevada, Jack, Miko and Rafael are accidentally caught in the crossfire of a fight between enormous transforming robots. They are taken to the base of the Autobots, where their leader Optimus Prime explains their origin and motive.

Megatron returns from a three year long exile with a sample of Dark Energon, which can revive Transformers from death as mindless zombies called "Terrorcons". While the Autobots try to stop them, Arcee notices that Cliffjumper is not himslf anymore.

The villains Starscream, Soundwave, Megatron and Shockwave kidnap the special agent 'William Fowler' with the motive to kill the 'Autobots' when they come to rescue the victim, in order to accomplish their mission of destructing the planet.

The kids along with Bulkhead, Arcee and Bumblebee sneak on to the Decepticon warship in order to rescue Agent Fowler. In the meantime, Optimus Prime and Ratchet fight off Megatron and his horde of Dark Energon zombies.

Optimus Prime and the Autobots race to stop Megatron from opening the Space Bridge to Cybertron and bring forth an army of Dark Energon zombies from the Transformers dead home planet. Will they succeed in this final mission?

To prove his leadership after Megatron's supposed demise, Starscream awakens Skyquake, a legendary Decepticon warrior and tries to recruit him in his new army. On the other hand, Ratchet helps Jack, Miko and Rafael with their school science projects.

Bulkhead and Bumblebee start examining a crashed space pod in the Arctic mission. Soon, the other Autobots discover large swarm of Scraplets in the pod which are highly dangerous form of Cybertronian wildlife that survives on metals.

The troops deny to abide by the new Decepticon leader Starscream's orders. In order to achieve their approval, Starscream awakens Skyquake. Will this trick bear fruit for Starscream?

Dingus, a dangerous nuclear device is escorted by the Autobots. However, Silas, part of the 'Mech' attacks the convoy with an intention of stealing the Dingus for their own use.

Soundwave snatches the Energon Harvester, a device that can drain energon, from the kids in the museum. Later, Bulkhead throws the Harvester into the air, where it safely explodes. Finally, Miko is saved from the guard and gets out of trouble.

Jack convinces Bumblebee to help him win an illegal street race in order to get back at school bully Vince. However, things go awry when Knock Out gets involved in the action, kidnapping Vince in the belief that he is Bumblebee's human partner.

A sudden visit from her old nemesis, Airachnid brings out Arcee's old fears. On Earth to collect a human head to add to her collection, Airachnid goes after Jack. In order to save Jack, Arcee must get past her inner demons before it's too late.

Optimus Prime and Ratchet explore a crashed Autobot ship when a deceased Autobot drips a plague inducing property into Optimus, who is then struck with a deadly virus. How will Arcee and Bumblebee find a cure?

Megatron gains control over Bumblebee's mind and tries to manipulate him in order to revive his original body and reclaim the Decepticon leadership. Meanwhile, Starscream steals a powerful telescopic lens and attempts to melt Earth's arctic icecap.

Jack,Miko and Raf get stuck in the shadow zone with no way out. Meanwhile, Starscream is upset over loosing his arm. A Zombie Decepticon attacks the children, but fortunately they get rescued by the Autobots.

Bulkhead and Breakdown battle each other, but Mech squad intervenes and abducts Breakdown. Optimus Prime and fellow Autobots plan a rescue mission to save Breakdown. Later, Bulkhead decides to save Breakdown. Will Breakdown get rescued?

Silas makes a deal with Airachnid to find Jack Darby's whereabouts, which in turn will get him Arcee. They kidnap Jack's mother and hold her hostage. Jack and Arcee, race against time as they battle Airachnid. But, luckily, Agent Fowler rescues them.

The Decepticons are after a powerful weapon known as the 'Polarity Gauntlet', that can manipulate magnetic fields. Arcee gets accidentally stuck to Bulkhead's back and they must settle down their differences and fight Airachnid and Breakdown.

While investigating an abandoned mining cave, Arcee and Jack finds Megatron, who is about to execute Starscream for treachery. The Autobots clashes against Megatron inside the cave and as a result the mine collapses with them trapped inside.

Megatron orders Starscream and Airachnid to a crash site, to retrieve a weapon. After detecting a Decepticon signal, Autobots reach the crash site. During their fight, Airachnid immobilises Optimus, while Starscream injures Arcee, and escapes.

Miko downloads the ancient knowledge that was stored inside Bulkhead's brain. Meanwhile, the Decepticons hunt Bulkhead down when they come to know that he has the secret formula for synthetic Energon.

Ratchet tests the Synthetic Energon formula obtained by Bulkhead from the Data Cylinder and injects himself with it. At first, the formula greatly increases Ratchet's strength, speed and agility. But before long, it starts to have adverse effects.

Optimus Prime recalls a doomsday prophecy connected to Earth and involving Megatron. Prime realizes that he can't end the Autobot-Decepticon conflict diplomatically, and decides to confront Megatron and destroy him once and for all.

Awakened, Unicron abhors Megatron as his servant. Following Unicron's rise, the people of Earth are put at the risk of extinction, but determined to not let it happen, the last descendant of the Primes, Optimus Prime, faces him.