When Marvel's Avengers: Age of Ultron hits theaters this May, the sequel will include all of Earth's Mightiest Heroes from Marvel's The Avengers, along with plenty of new faces as well. The studio has released a new featurette that showcases Quicksilver (Aaron Taylor-Johnson) and Scarlet Witch (Elizabeth Olsen). Director Joss Whedon says that these "super siblings" are "massively important new characters," and we also see new footage that shows how they were orphaned at just 10 years old.