I'd like it if Batman had a weaker strain of the Scarecrow's fear toxin and used it on criminals at one point. Then again, maybe the appeal of Batman is he doesn't need fear toxin to put fear in criminals. Would still be fun to see, though,
Superman/Batman, Avengers: Age of Ultron, Star Wars: Episode 7, Ant-Man, Daredevil and Fantastic Four ... The world isn't prepared for 2015.