The sequel to this year’s blockbuster film, The Avengers, is expected to hit the big screen in May 2015. Director Joss Whedon — who will write and helm the sequel — is believed to have already developed a template for the storyline, reported contactmusic. “Marvel has a very set agenda of what they want to do, they are already kind of ahead of the game on the sequel because they’ve got the guy that did it before, doing it again, and something tells me Joss already has the template for the film,” a source said. A number of cast members won’t be available to shoot the movie as they will be filming their own stand alone motion pictures. Actor Robert Downey Jr is to reprise his titular role in Iron Man 3 next year, actor Chris Evans will return as the lead character in Captain America: The Winter Soldier in 2014 and actor Chris Hemsworth is to star in Thor: The Dark World next year.