Joss Whedon has already voiced his reservations about a potential standalone movie for the Hulk, and has been speaking again about why he finds the character problematic.
"The Hulk is the most difficult Marvel property," says Whedon. "Is he a monster? Is he a hero? Are you going to root for a protagonist who spends all his time trying to stop the reason you came to the movie from happening?
"I don't think the first two movies nailed it," he continues, "but I don't envy the task. It was easier to have him in a group than to build everything around him."
"If he was Hulk for the entire movie, I think Mark [
] at some point would go, 'why am I here?' I would be less inclined to pursue a storyline where the Hulk is only ever the Hulk. Mark and I loved the Hulk and went over and over the concept of rage and how it should manifest, and that part of it was fascinating to both of us."
Sounds like we'll just have to wait until
The Avengers 2
then. The film lands in UK cinemas on 1 May 2015.