The Marvel Studios: Assembling A Universe behind-the-scenes documentary has begun airing on the East Coast, giving us all a sneak peek at Guardians of the Galaxy, Captain America: The Winter Soldier and Avengers: Age of Ultron, as well as the TV series Marvel's Agents of S.H.I.E.L.D.. Here, we have some concept art from this ABC special, which reveals the costume and character design for Elizabeth Olsen's Scarlet Witch and Aaron Taylor-Johnson's Quicksilver, as well as the Hulkbuster. Take a look, and then tune into ABC later tonight to see more from Avengers: Age of Ultron.