In the conclusion of the three-part Season 1 finale, the Autobots go to the Earth's core to fight for the planet; and Jack uncovers info about Optimus' background.
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In Part 2 of the three-part Season 1 finale, the Autobots acquire a surprising ally in their battle to save Earth.
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In Part 1 of the three-part Season 1 finale, Earth has an outbreak of natural disasters, caused by Dark Energon.
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The Decepticons quickly try to build a space bridge before a prophesied darkness arrives.
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Ratchet becomes a threat to everyone after he injects himself with an experimental substance.
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T.M.I.
Season 1, Episode 21
Bulkhead acquires a top-secret formula, and the Decepticons come after him for it.
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Partners
Season 1, Episode 20
Starscream makes an unexpected request after he is captured by Optimus.
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Two patrolling Autobots end up trapped in a cave with their enemies, Starscream and Megatron.
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The Autobots try to claim a magnetic weapon before the Decepticons get to it.
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Crisscross
Season 1, Episode 17
Airachnid makes a deal with Silas to get revenge against Arcee and Jack.
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MECH agents capture a Decepticon, and the Autobots mount a rescue.
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Shadowzone
Season 1, Episode 15
The kids are stranded with Skyquake in an alternate dimension during a GroundBridge malfunction.
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Megatron controls Bumblebee from inside his mind and influences his behavior at HQ.
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Sick Mind
Season 1, Episode 13
A Decepticon plague infects Optimus Prime, so Arcee and Bumblebee sneak onto the Nemesis to find the cure.
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Predatory
Season 1, Episode 12
Arcee must protect Jack when a routine mission is complicated by Airachnid's arrival.
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Jack tries to be impressive, with Bumblebee's help, but Knockout's arrivals sends things out of control.
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Miko and Bulkhead go up against Starscream and Breakdown as they go to Greece to retrieve an Energon Harvester.
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Convoy
Season 1, Episode 9
The Autobots are attacked while helping Agent Fowler transport an implosion device.
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Con Job
Season 1, Episode 8
Bulkhead awaits a visit from his buddy Wheeljack, but his arrival does not go as planned.
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Scrapheap
Season 1, Episode 7
Scraplets invade HQ while Optimus and Arcee patrol the Arctic, leaving Bumblee and Ratchet to repel the enemy.
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Starscream pursues other interests while Skyquake battles with Optimus Prime and Bumblebee.
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Conclusion. The Decepticons and the Terrorcons go into battle against the Autobots.
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Part 4 of 5. The Autobots try to stave off an attack from Megatron's Terrorcons to protect their human wards.
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Part 3 of 5. Bulkhead is unknowingly shadowed by Miko as he goes to rescue Agent Fowler, who was kidnapped by the Decepticons.
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Part 2 of 5. The Autobots go in search of Cliffjumper, whose life signal is weak, and find Megatron wielding the dangerous dark Energon.
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Part 1 of 5. 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 Autobots' conflict with the Decepticons.
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