Traitor

Mirage is suspected of betraying the Autobots after he is seen consorting with the Decepticons during a fight over rare electron cells.

At the Experimental Energy Research Laboratory, two scientists are working on the new electro-cells that will hopefully solve Earth's energy problems. Unfortunately, the cells won't be viable until they've been stabilized, which could result in a massive explosion. At that moment, Starscream and Skywarp break through the roof and take the cells. Megatron arrives to remove the cells carefully, as an explosion could be quite destructive, and the Seekers are not known for being gentle. Having taken the cells, Megatron transforms and has Starscream fire away, destroying the lab to prevent any more from being created.

Meanwhile, Cliffjumper is tearing toward the Autobot base. Heading into the control room, he informs Optimus Prime that he's found where the Decepticons have placed the electro-cells—in the same place Mirage patrolled yesterday. Mirage is shocked that he didn't get a reading on them, and Cliffjumper says that maybe Mirage did. Before any formal accusations are made, Optimus Prime politely tells Cliffjumper to shut up. The Autobot leader then leads a team to recover the cells.

At a canyon, the Decepticons have hooked up a buffer device to the cells. Starscream uses it as a chance to call Megatron a coward for not turning on the cells and filling energon cubes, then he activates it. The cells fill the cubes rather quickly, but just as quickly drain the cubes and explode. Megatron walks over to show Starscream the business end of his fusion cannon.

As he does so, the Autobots arrive, but are spotted by Laserbeak, who tells Soundwave. Megatron orders Soundwave to call in the Insecticons, with the promise of a special reward. A battle ensues, during which Mirage is injured by Skywarp, though he manages to tear off the Decepticon's insignia. The Insecticons then arrive, turning the tide of battle, but a stray shot by Shrapnel hits the buffer, risking an explosion. The Autobots take the Decepticons' distraction as a chance to retreat.

At the base, Mirage is repaired, while Cliffjumper continues his accusations of treason. Mirage defends himself, and Optimus orders Cliffjumper on recon, with instructions to inform them if Megatron tries to move the cells. Ratchet tells Mirage to rest, but Mirage doesn't need rest. Leaving the base, he heads to the Insecticons' hideout, where they are discussing their "special reward"—two energon cubes. Going invisible and sneaking into the base, Mirage swipes the cubes while the Insecticons aren't looking, leaving the Decepticon insignia in their place, then drives to the valley. However, Cliffjumper spots him.

Naturally assuming that Mirage is a Decepticon, Cliffjumper prepares to fire, only for the Insecticons to arrive. As Mirage slips away, Starscream discovers Cliffjumper, but the little guy is able to escape. Megatron comes to investigate, and they spot Mirage. They fire at him, but their lasers hit the ground near the Insecticons, who assume the Decepticons are firing at them. The Bugs and the Cons throw down, but Mirage is caught in the crossfire. Bombshell implants a cerebro-shell into Mirage and has him fire on the Decepticons as well. Megatron sees Mirage, puts two and two together, and convinces the Insecticons to stop fighting the Decepticons. Megatron also plans to use Mirage for a little trap of his own.

Heading back to the base, Cliffjumper tells Prime what he saw. Optimus, Ratchet, and Cliffjumper head to the valley, where Mirage greets them and explains his original plan, saying that the Insecticons fled from the battle and the Decepticons chased after them. Despite Cliffjumper's warnings, the Autobots head to retrieve the cells, only for the Decepticons to ambush them, with Mirage joining in on the fire. Cliffjumper attacks Mirage, throwing him some distance, which apparently deactivates him.

Bombshell commands Mirage to continue, but gives up. Ratchet then investigates and notices the cerebro-shell. Removing it allows Mirage to regain control, and he rejoins the fight—on the side of the Autobots. Prime makes a run for the cells, but Megatron concludes that if he can't have them, no one can. Firing randomly, he explodes the buffer device, sending the Decepticons everywhere possible as the Insecticons and Autobots retreat. Emerging from the wreckage, Megatron laments his hasty action.

—Skywarp as he breaks through the roof of a human research institute

—Megatron and Starscream argue over who is a better leader. Again.

—Megatron threatens to terminate Starscream. Again.

—Optimus Prime reprimands Cliffjumper for his suspicions.

—Cliffjumper and Starscream have a moment.