One of my all-time favorite Joker stories is The Killing Joke. The story was controversial because it brutally changed the status quo: Batgirl (Barbara Gordon) was now paralyzed from the legs down. Because of this, she would later become the hacker Oracle. It also recounted the Joker’s origin, building on how he started out as The Red Hood. I personally believe this story helped Batgirl become a better character, more than just a female, younger version of Batman.
I was excited when I learned that an animated feature was being made. When I learned that Mark Hammil, Tara Strong, and Kevin Conroy were reprising their roles as The Joker, Batgirl, and Batman, I was even happier. The movie even became DC’s first animated feature to have an R-rating. That’s really the only way the story can be done. This is the Joker proving that everyone is as twisted and sadistic as him. He believes all everyone needs to push them over the brink is a “bad day”. And this is him giving Commissioner Gordon and Batman that “bad day”.