The success of last year’s Superman proved that there was still some interest in comic-book movies, all of these years into their Hollywood-blockbuster dominance. The director James Gunn reintroduced viewers to the aw-shucks costumed champion, this time trying to make a name in a cynical, contemporary landscape, and Gunn’s approach made the classic superhero ideals of truth and justice feel fresh instead of corny. Tucked into the story was another caped crusader: Superman’s chaotic cousin, a