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#1: The Manhunters

How deadly are they? They destroyed all life within Space Sector 666 because of a "programming glitch." How big is a Space Sector? Unknown, although the entire universe is split into at least 3601 of them, and Final Crisis claims that there are "thousands of worlds" within Earth's sector. So let's just say that's a…

#2: Unicron

How deadly is he? He eats planets for breakfast. And lunch. And dinner. And if they're populated, all the better; it adds texture, apparently.
Who's responsible? It very much depends who you ask; Unicron has been given multiple histories throughout the years, including being a fallen god who somehow became a robot, a…

#3: The Cylons

How deadly are they? They destroyed the twelve colonies of humanity, committing genocide on a scale unimaginable to everyone except Glen A. Larson and Ron Moore.
Who's responsible? It depends on which version you're asking about. The original series had the robots built by a dying alien race also called cylons,…

#8: Ultron

How deadly is he? He singlehandedly slaughtered the inhabitants of the fictional European nation of Slorernia, before enslaving the alien robot race the Phalanx and taking over countless planets as a result, for his own nefarious ends.
Who's responsible? Hank Pym (the superhero known as Ant Man, Giant Man, Goliath,…

#9: ABC Warriors

How deadly are they? As deadly as you want them to be; in the future's Volgan war (When the west goes to war with the fictional Russian-analog "Volgan Republic"), human soldiers are slowly replaced by robots created to fight wars. Slowly enough, in fact, that the ABC Warriors get more than a few kills in before the…

#10: Mechagodzilla

How deadly is he? He rampages continually against Japan and fights Godzilla on a regular basis, with his laser eyes and flamethrower breath. I'm guessing there's got to be some level of collateral damage going on there. Also, he kills giant monsters, which can come in handy.
Who's responsible? Originally alien monkeys…

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