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Few Cybertronians appeared to know of the mysterious Metroplex's existence. He was stumbled upon by the Throttlebots, who were fleeing from an attack by Sixshot on a research station they had been assigned to as couriers. To them, it seemed as though they had come across an abandoned city, where they were forced to make their hopeless stand against Sixshot. The disturbance their battle created awoke the sleeping giant, and Metroplex rose. He dominated Sixshot with a single blow, ending the fight.
However, the Throttlebots saw no further assistance from Metroplex. The giants primary concern was that his position had been compromised. Apparently, he had been in hiding as part of some mission to protect an unknown item he was in possession of. He told the Throttlebots that he wept for his fellow Autobots, but his mission had to take priority over all else. He transformed into a spaceworthy vessel and abandoned them on that world with a badly damaged but living Sixshot. There were resources and a shuttle they could make use of, but they had received all the help they would see from him.
Transformers: Fall of Cybertron - Metroplex appears in all versions of the game and is voiced by Fred Tatasciore. During Optimus Prime's defense of the Ark which was left open due to Grimlock and his team leaving their post, Perceptor guides Optimus to various power stations and turrets in order to help the war effort. Once Optimus is one a large turret it suddenly stops firing and opens a path that is not on Perceptors blueprints where Optimus senses the spark of Metroplex and orders him to aid in the fight. Metroplex begs the call of the last Prime and arises to defeat the Decepticons. Metroplex aids Optimus by providing him artillery strikes to decimate Decepticon tanks, troops, and equipment. Optimus and Metroplex target and destroy 2 of 3 Decepticon Artillery cannons, but at the 3rd and final cannon Metroplex takes a direct hit to the chest and is knocked offline. Optimus attempts to shutdown the gun by himself though is ambushed by Starscream and the Combaticons (Onslaught, Brawl, Blastoff, Vortex, and Swindle) and captured. Once taken before Megatron inside the 3rd cannon Optimus is rescued by Metroplex who rips the roof of the cannon and proceeds to pummel Megatron into spare parts. Starscream orders a hasty retreat and claims leadership of the Decepticons. Metroplex serves as the defense for the Ark until the Autobots lose the last shipment of Energon. Metroplex then sacrifices his own spark to power the Ark in the hopes the Autobots would survive in space. Metroplex falls over dead right as the Ark takes off saying "Till all are One". Due to his size only Metroplex's head is available for use in multiplayer.