While exploring the ruins of Gigantion, Drill Bit, Bud Hansen and the other Mini-Cons uncovered a lost Mini-Con city. While he held his own for a while, his foes' superior numbers eventually overwhelmed him and he was tackled to the ground. Repairs on Metroplex's space bridge continued, with Windblade and a recently revived Wheeljack working together.

After the city was completed, the Decepticons repainted it and claimed it as their own, renaming Metroplex as Metrotitan, but when Metrotitan transformed to robot mode, the base fell apart in a shower of blocks, as the Autobots had been snacking on the building blocks. After serving as Neo Akihabara City's mayor's office for a while, Metroplex requested that the mayor, Megatron, let him go so that he could enjoy being free in this peaceful world. This Titan's great modesty about his power and achievements together with a boundless patience necessitated by his size and alternate mode are apparent to anyone who pierces his normally less than talkative demeanor, and in the optics of many, these traits only raise his already high standing. Metroplex had been lying dormant in what would become Autobot City for thousands of years, and inadvertently became a part of the battlefield when Megatron attacked the Ark. There's a lot of stuff on the radar for 2022 with more of what fans have been asking for from the G1, Beast Wars, Armada, Prime, and more series from the past.Metroplex accessed the prison where Chromia was held and directed her to free Windblade from Vigilem. Mentally merged, Metroplex revealed the real culprit behind the trouble to Windblade, as well as revealing the existence of many more lost Transformer colonies. With a new voicebox and optics, Metroplex transformed and began slaughtering his undead brethren as Windblade rerouted power to his combat systems.

Remaining near the crater, Metroplex was swarmed and taken down by an army of Kickback clones during Scorponok's plan to destroy the Legends World. Metroplex dealt with Trypticon quickly and focused his fury on Sixshot, but the revenge-hungry Autobot was mistaken in his belief that Trypticon had been defeated. Days later, after the Autobots located another source of energon—only for it to be halved thanks to the Decepticons—Metroplex offered to sacrifice his life, donating the energon inside him to give the Ark enough juice to launch.

Emerging fom his underground birthplace, Metroplex transformed from city to battle station mode and took off for the battleground. However, the villain gloated too much, and Metroplex revealed his survival by ominously approaching from the back of Megatron's base.

Windblade came to the conclusion that Starscream was trying to recover remnants of Shockwave's Regenesis ores. However, Trypticon had merely been a distraction: as Metroplex stood victorious, he was impaled and pinned to the ground by Megatron's incoming starship, knocking him offline. Also, several times in the show where Metroplex was depicted in a smaller environment, he was in his "work" mode without explanation or transformation shown.

After the battle, he became Iacon's new capital by transforming into city mode over the ruins of the Citadel. Metroplex realized that while Menasor was going down the wrong road, he himself had been young and arrogant at one time, and acting all high and mighty was counter-productive. The fight was distinctly one-sided, and before long, Metroplex had successfully driven the invading aliens off. I think it is time for transformers to get a dedicated collector line like the other series; the movie figures will likely fill in the general releases.