joker

Jared Leto put up something of a fit recently because he claims he feels he was tricked into being a part of the Suicide Squad movie...what do you make of all that noise?

This Killing Joke covers what's widely accepted as the origin of the Joker and some of the events that lead up to Barbara Gordon (Batgirl) becoming paralyzed (after which she eventually becomes Oracle). There's also a featurette with more explanation on the origin of the story and the people working on this movie: 

If we had any doubts about Troy Baker taking over the Joker's voice in Arkham Origins, they've been settled in his impromptu monologue from The Killing Joke at NYCC.