Fresh from his success as the super-heroic Iron Man, Robert Downey Jr. may continue riding tall along the comeback trail as the star of... no kidding... Cowboys & Aliens. Based on the graphic novel by Fred Van Lente and Andrew Foley, the sci-fi Western centers on a battle between Apache warriors and paleface settlers that is interrupted by the crash-landing of a spaceship near Silver City, Arizona. Downey currently is in negotiations to play Zeke Jackson, a notorious gunslinger (and...