Decepticon City

Decepticon City is the Decepticons' main base on Earth.

Big Looker storybooks
Spying on Autobot City with a number of his soldiers, Galvatron became jealous of the Autobots for their base because its facilities allowed the Autobots to harvest lots of energy. This meant they didn't have to waste time stealing fuel like the Decepticons, whom Galvatron believed could spend it better waging war. Starscream agreed and suggested the Decepticons to build their own city, but Galvatron dismissed that idea, stating he needed the Decepticons for battle.

While discussing who else could build them Decepticon City, Soundwave reported on a human car show that would feature a voice-controlled robot car. Galvatron declared the robot car to be the worker they needed, which they'd steal and research to create a larger workforce suited for the task.

In the end, the theft was prevented by the Autobots and Decepticon City never built.

Shattered Glass
Soon after meeting positive polarity Ultra Magnus's team on Cybertron, Galvatron suddenly received word from Cyclonus that Decepticon City was under attack. Galvatron ordered Cyclonus to get Blast Off to prepare a shuttle so that they could travel to Earth. Galvatron's team departed Cybertron aboard the Annex and soon arrived on Earth. While positive polarity Grimlock and the Predacons engaged Superion, the Annex touched down, and Galvatron instructed Cyclonus and Scourge to find Starscream to prepare a counterattack. Meanwhile, Galvatron took the fight to Optimus Prime. Though Prime proved to be the better combatant, the interference of the ever-scheming Rodimus allowed Galvatron get ahold of Rodimus's gun, which Galvatron leveled at Prime. Galvatron decisively defeated Prime, prompting the Autobots to pick up their leader, board Sky Lynx, and hightail it back to Cybertron.