Metroplex is a gigantic Autobot whose alternate mode is a city. A more than capable arsenal in the Autobot ranks, Metroplex doesn't care for his own safety and is more than willing to sacrifice anything if it means securing the victory for his fellow comrades in the war. He has tremendous power, is loaded with rockets and isn't afraid to crush Decepticon leaders with his fist. In other words, don't piss him off.
Hidden beneath the streets and amongst the buildings of Iacon lies Metroplex. One of the ancient titans of Cybertron, Metroplex is awakened by Optimus Prime to defend Cybertron as an Autobot. His size requires a vast amount of Energon, which limits the amount of time Metroplex can stay in robot mode.
His veichle mode is a Cybertronian truck on Cybertron, when arriving to Earth he adapts the Earth veichle mode of a long-nose semi-trailer truck.