CAUTION: This review contains major spoilers for Batman: The Killing Joke
The traditional superhero story is a simple one. The bad guy threatens to do some bit of evil; the good guy comes in to stop it, and the day is saved. Lather, rinse, repeat. The costumes change, and so do the capers, but for a while, that was the dependable, well-worn blueprint for the battles between capes and criminals.
And then, somewhere along the line, that started to change. Writers like Alan Moore began to deconstruct those old stories. They started to look at the ways that these battles might not be so weightless, how those heroes and villains might still leave their marks on one another. These artists examined how the good guys could not fight evil day after day, week after week, year after year, and yet come out of those battles unsullied, unblemished, and unscathed.
Batman, after all, fights monsters. How long can you run headlong into battle with monsters before you start to become more monstrous yourself? It’s not every comic book adaptation that drops references to Nietzsche, even when it’s one of his most famous quotes, but it’s appropriate for Batman: The Killing Joke, an animated film adaptation of the Alan Moore classic. Because more than The Joker, more than Batman, more than Jim or Barbara Gordon, it’s a story about what happens to those who fight monsters. It’s a story about the abyss.