Mark Ruffalo Shares Avengers: Age Of Ultron Behind The Scenes Photo With Joss Whedon

Mark Ruffalo has posted another photo from the set of Avengers: Age of Ultron. The photo is a selfie shot of himself with director Joss Whedon. That status included with the photo reads: "Me and Herr Director @josswhedon . Our fearless mutant leader." Ruffalo treads a fine line by referring to Whedon as a "mutant." If he keeps that up he might be receiving a cease and desist letter from Twentieth Century Fox. Avengers: Age of Ultron began principal photography in London earlier this month, reuniting the cast of the original film. Avengers: Age of Ultron will come to theaters May 1, 2015.