There's probably a way to expand on the events of The Killing Joke and craft a story that doesn't elevate Batman and Joker at the expense of Batgirl. Sadly, this movie doesn't find the answer. As an adaptation, The Killing Joke succeeds only when it sticks closely to the source material. Its attempts to embellish the original story end in disaster. Fans of that story or Joker in general should give it a watch, but maybe fast-forward through those first 30 minutes.