Bulkhead goes to a volcanic island on the Equator to find the fourth and final Iacon relic. But to his horror, he discovers that the relic is a piece of Tox-En, a form of highly toxic Energon that is lethal to Transformers. He tries to dispose of the tox-en by throwing it into a volcano, but it deteriorates his strength, and things are made worse when a group of Insecticons led by Hardshell arrive in search of the relic.
Ratchet reluctantly calls upon Wheeljack for back-up in his mission to retrieve the third Iacon relic, a sonic weapon called the Resonance Blaster. On their way to the location, the two Autobots are attacked by Soundwave, but Wheeljack manages to shoot down and disable Soundwave’s surveillance drone Laserbeak, which gives Ratchet an idea. While Wheeljack and Soundwave fight over the Resonance Blaster, Ratchet uploads a virus into Laserbeak that will download the Iacon Database into the Autobot base’s computers without the Decepticons noticing.
Miko rushes out onto the battlefield during a fight between the Autobots and the Decepticons, who are fighting over a Data Cylinder, a device containing knowledge of Cybertronian society. As Miko attempts to push the Cylinder into an open Ground Bridge, she accidentally activates it, which downloads all of its information – in this case the formula for a Synthetic Energon – into Bulkhead’s brain. Soon, Bulkhead begins to rhyme off the complicated formula, painting the equation on the walls, and Miko becomes scared when her friend’s personality and memories begin to slip away.
Megatron sends Starscream and Airachnid to the site of a crashed Decepticon ship to recover The Immobilizer, a powerful weapon with the ability to freeze Transformers in their tracks. But after the Autobots discover Starscream bound up in Airachnid’s web, they are surprised when Starscream states that he wishes to join them… Note: This episode is dedicated to the memory of Captain H.L. Larry Cullen (Peter Cullen’s older brother who helped inspire Optimus Prime’s voice), who died in March 2011.
Bulkhead, Arcee, Jack and Miko investigate an old Decepticon Energon mine that was supposedly stripped clean. Megatron and Starscream arrive shortly after, with Megatron accusing Starscream of hoarding Energon, and revealing that he knows about Starscream’s other treacherous acts. Megatron is about to kill his devious second-in-command when he notices Jack and Arcee, and immediately opens fire on them. This accidentally causes a massive cave-in, leaving everyone trapped inside the mine with no way out.