Batman & Conan! Has a nice ring to it, doesn't it? Unfortunately, we may be waiting a long while before TV funnyman Conan O'Brien slinks into a costume and joins the Caped Crusader on a crime-fighting adventure, but we won't have to wait long to see him immersed in the Batman universe. Conan has joined the voice cast of Warner Bros./DC Entertainment's upcoming animated feature 'Batman: The Dark Knight Returns, Part 2'. So who will he be playing?