Robert Downey Jr.

If there's one characteristic you need to be a part of The Avengers franchise, it's keeping your mouth shut!

In our video below, watch us try to get some scoop from the cast, including Robert Downey Jr. and Mark Ruffalo. Although they're mostly tight-lipped about Avengers: The Age of Ultron, which hits theaters May 1, 2015, we did get newbie Aaron Taylor-Johnson, who's playing Quicksilver, to share his thoughts on joining the project: "It's like being invited to be on the biggest team ever!"