Megatron manipulates the impaired Optimus into joining the Decepticons

Jack & Arcee travel to Cybertron in an attempt to retrieve the knowledge of the Primes when they meet up with a new foe in the form of an Insecticon. Meanwhile on Earth, Ratchet, Bumblebee & Roadblock fight off Decepticon troopers attempting to retake control of the space bridge.

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.

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

The thrilling conclusion to 'Operation: Bumblebee!'! Can Starscream and Silas's evil plan be stopped?

Optimus clashes with a famous Autobot who returns to Earth on a mission to capture a new Decepticon.

Arachnid and Starscream fight to control an Insecticon; the Decepticons lose more soldiers.

MECH reveals their ultimate plan when a Optimus Prime duplicate starts terrorizing the general public.

Agt. Fowler must defend recent occurrences as the threat of a possible shutdown looms.

Bulkhead finds himself trapped on Megatron's ship while Arachnid & Starscream to launch separate attacks in an attempt to bring Megatron down.

Megatron infuses The Nemesis w/ his own supply of Dark Energon which results in the ship taking on a life of its own with its own agenda. Meanwhile Optimus reluctantly decides to use the Spark Extractor in an attempt to bring the war to an end.

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.

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.

Bulkhead faces a life & passing struggle while attempting to obtain the last Cybertronian relic.

Miko and Wheeljack embark on a quest for revenge.

Arcee and a friend uncover a feat of Decepticon engineering intending to destroy the Autobots.

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

Silas is given a new lease on life and approaches Megatron with a plan to join the Decepticon ranks.

Jack teams up with a new partner; Megatron tries to hide a legendary weapon from Optimus Prime.

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

Knock Out gains control of the power of sound, while Starscream works on the power of hyper-speed.

When Smokescreen is captured by the Decepticons, he uses the opportunity to find out the location of the Omega Key. Will this help him locate the other stolen keys?

Starscream once again offers up his allegiance to Megatron, much to the displeasure of Dreadwing.

The Autobots and the Decepticons fight on Cybertron as they pursue the Omega Lock.

Megatron forces Optimus to make a difficult choice for the team.