Mark Ruffalo doesn't believe a standalone Hulk movie will ever come to fruition, because it is "very expensive" to make due to the CGI costs.
Mark Ruffalo Doesn't Think a Standalone 'Hulk' Movie Will Ever Happen | THR News Video
Mark Ruffalo says he'd love to play the Hulk again in the future, but he thinks it's unlikely that a solo movie about the character..
The Hollywood Reporter