Aliens must be the kings of the cross-over. They’ve met Predators at the movies, and had comic-based run-ins with DC Comics‘ superheroes and even Judge Dredd. But this really takes the biscuit. The twist in this tale is that the heroes – Superman and Batman – can’t agree on what to do with the alien invaders they find deep in the Andes. So will the heroes come to blows? Or will they take sides with the extra terrestrials? Or is this just a team-up too far?