As Sari and Professor Sumdac deal with the fallout of the shocking discovery, the Autobots try to contact Cybertron to warn them of the traitor Longarm in their midst. Meanwhile, Megatron inadvertently stumbles upon a new plan to conquer Cybertron, where an increasingly desperate Longarm/Shockwave tries to cover his tracks.

As Sari and Professor Sumdac deal with the fallout of the shocking discovery, the Autobots try to contact Cybertron to warn them of the traitor Longarm in their midst. Meanwhile, Megatron inadvertently stumbles upon a new plan to conquer Cybertron, where an increasingly desperate Longarm/Shockwave tries to cover his tracks.

As Sari and Professor Sumdac deal with the fallout of the shocking discovery, the Autobots try to contact Cybertron to warn them of the traitor Longarm in their midst. Meanwhile, Megatron inadvertently stumbles upon a new plan to conquer Cybertron, where an increasingly desperate Longarm/Shockwave tries to cover his tracks.

Bulkhead and Isaac Sumdac try to rebuild the Space Bridge that Megatron had built. When Bulkhead convinces the Constructicons to help out, a combination of a forklift, a Headmaster unit and an Allspark fragment gives birth to Dirt Boss. Meanwhile, the others track down any remaining Decepticons and run into Lugnut.

A crazed Wasp finds his way to Earth to exact his revenge on Bumblebee... but he doesn't count on the Elite Guard following him.

Sentinel Prime has incredible success capturing fugitive Decepticons, leading Prowl to suspect he's getting help.

The Autobots and the Elite Guard pursue Wasp for their own agenda. However, Blackarachnia has Swoop capture Wasp in her latest attempt to rid herself of her organic half. This experiment goes awry and turns Wasp into Waspinator.

On Christmas Eve, Optimus Prime patrols the city in search of Soundwave. With Porter C. Powell selling Soundwave action figures, Optimus is paranoid that the real Soundwave is out there. When the Autobots drift off to sleep, they awake as full fledged humans. Now they must figure out what happened to them while dealing with a Decepticon onslaught.

It turns out that Soundwave has trapped the Autobots in a virtual reality intending to brainwashing them to his way of thinking. Now, Sari must free them before Soundwave completely turns them into Decepticons. She ends up gaining unlikely allies in Snarl, Scrapper, and Wreck-Gar.

The Space Bridge on Earth is finished. Meanwhile, the Elite Guard ship holding most of the Decepticon prisoners heads straight into an ominous space storm. The space storm reactivates Swindle who frees the Decepticon prisoners and takes over the ship. Optimus Prime identifies the "Broken Lance" code from Sentinel Prime and uses the Space Bridge to transwarp to the ship.

Ratchet activates Bulkhead's Space Bridge, which ends up sucking Captain Fanzone into it with Ratchet following him. They both end up on Cybertron around the time Sentinel Prime has declared a lockdown. Omega Supreme has arrived on Cybertron with Megatron, Starscream's head, and Lugnut. Thus, Shockwave (still possessing Ultra Magnus' hammer) attempts to get Omega Supreme's access codes from Arcee herself instead of Ratchet to reprogram Omega Supreme. In the end, Ratchet caught Ultra Magnus' hammer, Jazz joins Optimus Prime's team, and Arcee was shown to have her memory back.

The Autobots discover Arcee's energy signal on the Moon. Rachet insists on going there right away to save her, but Prime refuses, knowing that they are too weak to fight Megatron. Rachet, Sari and Professor Sumdac build flight boosters for Optimus to even the chances. Prowl tries to put the Allspark back together, using processor over matter. Meanwhile, Shockwave finally gets Arcee's codes and uses it on protoforms (stolen by Starscream, to make his clones) to duplicate Omega Supreme. Finally, Omega Supreme's clones fly from the Moon to invade the Earth. The episode also shows some of Optimus Prime's memories about being expelled from Elite Guard and meeting the other main characters.

The Lugnut Supremes touch down on Earth and launch a full scale assault on Detroit. At first, Optimus and Prowl battle the clones with their aerial upgrades. After the clone with Megatron inside is defeated, Megatron disembarks on his own. Meanwhile, Starscream pieces himself together and heads for Earth as well. On the Moon, Ratchet and Sari revive Arcee and return her memories, and retake control of Omega Supreme from Lugnut and Shockwave, who are defeated. Soon, when the clones are freed, Starscream reveals he had planted a self-destruct bomb inside the Omegas, which will destroy everything within a 100 mile radius. Prowl and Jazz manage to piece the AllSpark together from the scattered fragments (killing Starscream in the process, by removing the piece in his head) to deflect the blast, but only when Prowl sacrifices his Spark does it come to fruition. Eventually, Megatron, Shockwave and Lugnut are taken into custody, and the group returns to Cybertron with the Decepticons, Omega Supreme, and Prowl's body, greeted by an enthusiastic crowd of Cybertronians.This is the last episode of Transformers Animated.