The Marvel Universe's heroes have faced off against countless deadly foes but few have brought the entire planet to its knees the same way as Ultron. Ultron is a robot of immense power and intelligence who quite often uses this intellect to create a mechanical army to take on his usual foils, The Avengers, but what if he didn't have to create the army? Marvel has missed a major opportunity for Ultron by never taking over The Sentinels, robots created to combat the mutant threat and usually involved with the X-Men.
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