Marvel released the trailer for Avengers: Age of Ultron online Wednesday, featuring James Spader's Ultron and the rest of the gang: Tony Stark, Thor, Captain America, Hulk, and Black Widow, as well as newbies Scarlet Witch and Quicksilver. The movie will hit theaters May 1, 2015. Watch the trailer below, and see if you can't get that haunting rendition of "I've Got No Strings" out your head..