Mark Ruffalo has been doing the rounds for his movie Infinitely Polar Bear (we assume he's playing some kind of CGI bear that discovers an infinity stone... right?), and dropping some hints about Hulk's role in Thor: Ragnarok along the way. "The Banner/Hulk consciousness is beginning to meld a little bit," Ruffalo said. In the comic book storyline Planet Hulk, Hulk simply stopped turning back into Banner.