qqp question1: In the end of Iron Man 3, Tony Stark undergoes surgery to get the arc reactor removed from his chest. So, in the Avengers: Age of Ultron, is he just like everyone else (e.g., Rhodey) using the suit? If that's the case, why can't Captain America, Black Widow and Hawkeye use it too? question2: With no arc reactor and suits left, what is next for Tony Stark? How is Iron Man 4 going to be?