Director: Joss Whedon Starring: Robert Downey Jr, Chris Evans, Chris Hemsworth, Mark Ruffalo, Scarlett Johanssen, Jeremy Renner, James Spader, Samuel L. Jackson, Elizabeth Olsen, Aaron Taylor-Johnson Written by: Joss Whedon (based on the comic book) Stan Lee and Jack Kirby Running Time: 142 mins Cert: 12A Release date: 23rd April 2015 Joss Whedon certainly knows…