Over the last month or two, there’s been a lot of talk surrounding a standalone Hulk movie, particularly one adapted from World War Hulk or Planet Hulk. Mark Ruffalo tweeted just yesterday that he wouldn’t be making another appearance as Bruce Banner until Marvel’s The Avengers 2.
Avengers director Joss Whedon also had a few words on the matter last week, but in a recent interview with Deadline the filmmaker expanded on his original answer, noting exactly why he thinks a Hulk movie is so damn tricky:
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Source: FULL ARTICLE at IGN Movies