To begin...
Mark Hamill will return to his role as the Joker in the animated adaptation of one of the best-known Batman stories of all time, The Killing Joke. No word yet on whether Kevin Conroy will be back as Batman.
Speaking of Batman, I recently saw an earlier animated movie, Year One. The actor who voiced Batman here would later go on to play Jim Gordon on Gotham, while Gordon is voiced by none other than Bryan Cranston.
The movie contains what I believe to be the first instance of any version of the character dropping an F bomb:
https://www.youtube.com/watch?v=XctkhiIf2IM

