You wouldn't like him when he's solo... and on another planet...
In a recent chat with IGN, Avengers/Avengers: Age of Ultron director Joss Whedon talked about the difficulties of adapting Hulk to the big screen, saying there is "horror movie Hulk," and "superhero movie Hulk," and waxing about the difficulty of balancing both aspects of the character.
“I always think that there are basically two Hulks. There’s horror movie Hulk and superhero movie Hulk. In the first film we got a taste of both and it really has to do with Banner’s attitude about who he is when he turns into the Hulk. And since the movie begins with the team together, the first thing we see is superhero Hulk, who has a level of cogency that makes him still useful and he isn’t just swatting things madly. But then, once the Scarlet Witch gets done with him, we get to see a vision of him that we have never seen before where he is completely out of control. And also clearly in a lot of pain. It was kind of beautiful to be able to go that far with him,” said Whedon.
Whedon then moved on to discussing the problem with bringing a story like "Planet Hulk" to the big screen, saying “It absolutely could be put onscreen. I don’t know if it should. I think part of what makes the Hulk great is the world around him and the Banner of it. And it would be mad expensive as well. I think if they were going to do a Hulk movie, they’d want to keep it more grounded.”
Whedon also explained that the biggest hurdle in making a Hulk film is the issue of the Hulk's film rights being tied up with other studios, saying “Honestly I think it’s a legal thing. I think it’s because there’s other studio rights and this and that. It’s difficult. Hulk movies are very difficult because it isn’t a classic superhero story. It is more of a werewolf story, and finding a way to thread both of those makes if difficult. But I think it has more to do with the boring issues… because they love the Hulk and they love Mark Ruffalo as much as I do.”
Hulk next appears onscreen played by Mark Ruffalo in Whedon's Avengers: Age of Ultron, which opens May 1.