City of Steel
New York City was under siege. Not by any super-villains, though that was a common enough sight. Not by subterranean terrors as usually brought up by the Mole Man and not by hordes of Atlantean warriors in fishbowl helmets. Not even by any of the myriad alien races that liked to show up and get the stuffing kicked out of them by Earth's super-heroes.

Technically, these invaders were alien. But not like most others. These were very large, three of them nearly thirty feet tall, the last more than twice that.

"Come on out, accursed Autobots!" the leader, a massive grey robot with a cannon on his arm shouted. "Why do you not defend these humans?"