15 Greatest Marvel Comic Book Villains Of All Time

8. Ultron

Created by Hank Pym, Ultron is an android who hates humanity and is made even more dangerous by the fact that he has some serious daddy issues. He's pretty much immortal too thanks to his conciousness surviving even after his body is destroyed, and so Ultron has reared his ugly head in many different forms over the years.

He's even succeeded in conquering Earth and wiping out most of The Avengers, and that was only put right by some time travel shenanigans which left the Marvel Universe with some long lasting damage. The villain has even set his sights on outer space, wiping out entire planets in his quest for domination! Regardless of where Ultron returns though, his plans for domination are always significant.