We are quickly approaching the release of Marvel's Avengers: Age of Ultron . For many fans, this will be a bittersweet treat, in that it marks the swan song for Joss Whedon's work in the Marvel Cinematic Universe. The director is of course behind the first Avengers movie, and has played a key role in the development of several additional Marvel films.

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After achieving great success and helming one of the most highly-anticipated films of 2015, Whedon has decided that it is now time for him to move on to other projects.When asked if the appeal of Spider-Man might be enough to temp him to remain in the Marvel sandbox just a little bit longer, Whedon replied, "There's a lot of good sand in this box, I'm not going to lie. I'm mean I've wanted to make superhero movies since I knew that there were superheroes and that there were movies. And for a long time I didn't think that was going to happen. And then it did...For like, five years. But I think having done that and having fulfilled that dream, hopefully people will like the movie and think it was a good idea to fulfill that dream. I have to do something else. Have another dream. And that would mean sleeping. Perhaps a dream of sleep."You can see Whedon's final film (for now) in the Marvel Cinematic Universe when Avengers: Age of Ultron opens in May.

Roth Cornet is an Entertainment Editor for IGN. You can follow her on Twitter at @RothCornet and IGN at Roth-IGN