The Autobots face the Decepticons for a final showdown.

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

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

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.

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

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

Two patrolling Autobots end up trapped in a cave with their enemies, Starscream and Megatron.

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'

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

A Decepticon plague infects Optimus Prime, so Arcee and Bumblebee sneak onto the Nemesis to find the cure.

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

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

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

The Ultimate Autobot Hunter is unleashed on our heroes.

Airachnid makes a deal with Silas to get revenge against Arcee and Jack.

The Decepticons launch a new scheme to clone an army of beasts.

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

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

Following from the events of the previous episode, Agent Fowler is sat down to explain recent events to his superior, the cynical and disbelieving General Bryce. Threatened with a military tribunal and Team Prime's termination, Fowler tries to convince the General that the Autobots are still on the military's side, but the General believes that Optimus Prime went rogue and has perished, failing to fully understand that Nemesis Prime was not the real Optimus.

The kids are stranded with Skyquake in an alternate dimension during a GroundBridge malfunction.

The Autobots go in search of Cliffjumper, whose life signal is weak and find Megatron wielding the dangerous dark Energon.

Jack tries to be impressive, with Bumblebee's help, but Knockout's arrivals sends things out of control.

Bulkhead is unknowingly shadowed by Miko as he goes to rescue Agent Fowler, who was kidnapped by the Decepticons.

Arcee must protect Jack when a routine mission is complicated by Airachnid's arrival.

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

Megatron goes on a conquest to reveal the rest of the relics while Arcee and Bumblebee race him to New York City before Megatron gets there.

Starscream pursues other interests while Skyquake battles with Optimus Prime and Bumblebee.

MECH agents capture a Decepticon, and the Autobots mount a rescue.

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.

Bumblebee questions his worthiness to his team after he is compromised.

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...

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

In an effort to secure a peaceful truce that would be beneficial to all parties involved, Starscream offers Megatron a ceasefire but Dreadwing has other ideas and does whatever he can to keep the diplomatic agreement from taking place.

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 Autobots try to claim a magnetic weapon before the Decepticons get to it.

The Autobots try to stave off an attack from Megatron's Terrorcons to protect their human wards.

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.