Earlier today, we reported that Warner Bros. is interested in Joaquin Phoenix playing the villain in their upcoming superhero sequel, Batman vs. Superman. While much of the casting has yet to be finalized, we now have word of another screenwriter joining the behind-the-scenes mix in Oscar-winner Chris Terrio (Argo). David S. Goyer penned the first draft of the film that finds Henry Cavill reprising his role as Superman, with Ben Affleck starring as an older, weathered Batman and Gal Gadot stepping into the shoes of Wonder Woman. Terrio, who has a strong relationship with Affeck, has brought in to clean up the script before production gets underway. Hit the jump for more.