Ultron is The Avengers' most fierce enemy to date, a mega-intelligent AI capable of restructuring himself, commanding a huge army of drones and desperate to wipe humanity off the face of the Earth to feed his massive God complex. Even with the likes of Scarlet Witch and Quicksilver joining the fray, how will the superhero super-group find a way to destroy Ultron once and for all? The Likely Answer: Given how much he's been kept out of advertising, one suspects The Vision may have a big say in this, with his powers being kept under wraps until the end of the movie, where he shows up when The Avengers have completely lost hope and uses his ridiculous abilities to take care of Ultron and his army.