Ultron

Ultron was designed by Dr. Henry Pym to be the ultimate peacekeeping android. But when his programming determined that mankind was actually its own greatest enemy, Ultron decided to solve the problem by wiping humanity from existence.

Due to his genocidal tendencies, Ultron soon found himself banished from Earth by Pym and his fellow Avengers. After spending decades conquering cosmic civilizations, Ultron decided to return to the solar system where he was created when he discovered that a mysterious assailant was attempting to erase all traces of him from the timeline.