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

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

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'

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 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.

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...

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.

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.

Jack learns how to restore Optimus' memory.

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

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

Earth has an outbreak of natural disasters, caused by Dark Energon.

Megatron manipulates the impaired Optimus into joining the Decepticons.

The Decepticons and the Terrorcons go into battle against the Autobots.

Bulkhead, on mission for the fourth relic, came back in critical condition via ground bridge. What happened?!? One epic showdown as Bulkhead and Hardshell go head-to-head in the ongoing quest to gather the last of the Iaconian relics on Earth.

Miko and Wheeljack embark on a quest for revenge.

After being granted a new start in his life, the ever stone-faced Silas begins to see the world in a new light and makes an out-of-character decision to go to Megatron in the hopes that he will be allowed to join the ranks of Decepticon.

As the race for the Omega Keys grows more desperate, Knock Out harnesses the power of sound, and Starscream the power of hyper-speed.

Starscream makes an unexpected request after he is captured by Optimus.

Ratchet becomes a threat to everyone after he injects himself with an experimental substance.