Avengers: Age Of Ultron Spoilers - 16 Things We Know Will Happen

15. The Twins Fight The Avengers

It might not be a major revelation at this point, given the fact that the trailers have hinted at Quicksilver and Scarlet Witch being in cahoots with Ultron, but it's still interesting to note that when the Avengers take down Baron Von Strucker's castle in the opening sequence that they work with their captors against the invaders. It's key to note that they are still prisoners (having been forced to "volunteer" as test subjects in the comics prequel), but they've likely been conditioned into believing that HYDRA is the good guys and the Avengers are the villains. Which would explain why they respond to their presence with violence and then run off back to their home area of Sokovia. The question of course is what ultimately makes them change allegiance. Presumably they find out that their usefulness to Ultron has a sell-by date, and self-preservation draws them to the light.