Latino Review has posted up an interesting rumour they've heard about 'Phase Three' of Marvel Studios' cinematic plans.
According to the site, the ending of "The Avengers" sequel will see Mark Ruffalo's Hulk lost in space.
This will allow for the character's solo feature film adventure to be based on the 2006 comic fan favorite storyline - "Planet Hulk".
In that series, Hulk finds himself becoming a gladiatorial champion on an alien world.
Early plans are said to call for Hulk to return in "The Avengers 3" which could be based on the "World War Hulk" comics with Hulk seeking revenge for his banishment to space.
Source: Latino Review