The Autobots face the Decepticons for a final showdown.

Due to Megatron's crafty plan, Optimus must make a hard decision which could affect the whole Autobot team.

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

The Autobots go to the Earth's core to fight for the planet; and Jack uncovers info about Optimus' background.

Optimus begins to piece together his real identity using several clues (including Starscream referring to his as a "prime" -- whoops!), and eventually rebels against Megatron’s orders. Meanwhile, Optimus' Autobot pals hatch a risky plan to get their leader back.

The Autobots and Megatron's Decepticons are drawn into Cybertron to face each other in a heroic battle over their mutual quests for the coveted Omega Lock, which, once unlocked with the four keys, would reawaken Primus'

Knock Out and Starscream experiment with synthetic lead and threaten to take over the Deceptacon ship and unleash an old enemy.

Megatron doubts Predacon and its allegiance after Predacon reveals a secret of its own.

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

The Autobots find out about the Omega Keys and their secret. Meanwhile, Megatron attempts to control the power of the Primes.

When the Decepticons take him captive, Smokescreen learns of the location of the final Omega Key - and attempts to retrieve all of the other stolen keys from Megatron.

The Decepticons quickly try to build a space bridge before a prophesied darkness arrives.

The Autobots acquire a surprising ally in their battle to save Earth.

Now that the location of the relics have been exposed by Orion Pax, the race is on to find the next one. New recruit Smokescreen and Jack are on the job with the Autobots looking to cut down Megatron before the beats them to it.

While Optimus struggles to survive after Megatron’s destruction of the Autobot base, the separated members of Team Prime try to reconnect.

Soundwave is captured by the Autobots; Megatron revives an old plan.

Megatron sends Dreadwing, Airachnid and Breakdown to investigate the trail of a potential Energon source, but what Airachnid doesn't know is that Dreadwing and Breakdown have actually been ordered to kill her for her treachery. She eventually catches wind of this, however, killing Breakdown and running off into the woods. Upon arriving at an abandoned Energon mine, Airachnid encounters Starscream cowering from a large Insecticon. After using her abilities to control the creature, she contacts Megatron and tells him to come to the mine, planning to use the Insecticon to kill him so she can claim Decepticon leadership...

Bulkhead is trapped on the Decepticon Warship and amid dual tries on Megatron's life.

Optimus Prime travels to Antarctica to hunt down the second relic, but while there he is confronted by Dreadwing and Starscream, and finds himself caught between shifting alliances.

During a relic hunt, Ratchet and Wheeljack get a one-of-a-kind opportunity when Soundwave's flying minion, Laserbeak, is disabled.

The Autobots search for signs of each other, but start to lose hope while the Decepticons welcome a key player to their ranks. A win for Wheeljack may ultimately lead to an Autobot defeat.

Jack learns how to restore Optimus' memory.

Starscream goes on a quest for Red Energon; a new Autobot joins Team prime.

The Ultimate Autobot Hunter is unleashed on our heroes.

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