The Autobots go to the Earth's core to fight for the planet; and Jack uncovers info about Optimus' background.
The Autobots acquire a surprising ally in their battle to save Earth.
Earth has an outbreak of natural disasters, caused by Dark Energon.
The Decepticons quickly try to build a space bridge before a prophesied darkness arrives.
Ratchet becomes a threat to everyone after he injects himself with an experimental substance.
Bulkhead acquires a top-secret formula, and the Decepticons come after him for it.
Starscream makes an unexpected request after he is captured by Optimus.
Two patrolling Autobots end up trapped in a cave with their enemies, Starscream and Megatron.
The Autobots try to claim a magnetic weapon before the Decepticons get to it.
Airachnid makes a deal with Silas to get revenge against Arcee and Jack.
MECH agents capture a Decepticon, and the Autobots mount a rescue.
The kids are stranded with Skyquake in an alternate dimension during a GroundBridge malfunction.
Megatron controls Bumblebee from inside his mind and influences his behavior at HQ.
A Decepticon plague infects Optimus Prime, so Arcee and Bumblebee sneak onto the Nemesis to find the cure.
Arcee must protect Jack when a routine mission is complicated by Airachnid's arrival.
Jack tries to be impressive, with Bumblebee's help, but Knockout's arrivals sends things out of control.
Miko and Bulkhead go up against Starscream and Breakdown as they go to Greece to retrieve an Energon Harvester.
The Autobots are attacked while helping Agent Fowler transport an implosion device.
Bulkhead awaits a visit from his buddy Wheeljack, but his arrival does not go as planned.
Scraplets invade HQ while Optimus and Arcee patrol the Arctic, leaving Bumblee and Ratchet to repel the enemy.
Starscream pursues other interests while Skyquake battles with Optimus Prime and Bumblebee.
The Decepticons and the Terrorcons go into battle against the Autobots.
The Autobots try to stave off an attack from Megatron's Terrorcons to protect their human wards.
Bulkhead is unknowingly shadowed by Miko as he goes to rescue Agent Fowler, who was kidnapped by the Decepticons.
The Autobots go in search of Cliffjumper, whose life signal is weak and find Megatron wielding the dangerous dark Energon.
The Autobots go on alert as the Decepticons return to Earth in the series opener, Meanwhile a group of humans find themselves with new caretakers after stumbling into the middle of the Autobot conflict with the Decepticons.
