The Todd Phillips-directed, Martin Scorsese-produced Joker origin film is, in fact, a prequel to The Dark Knight, exploring how Heath Ledger’s incomparable version of the Clown Prince of Crime came to be.
Yes, you read that right: Scorsese’s Joker is actually part of Nolan’s Dark Knight universe.
If we’re going to be learning Ledger’s Joker’s origin, what’s to stop a sequel to The Dark Knight Rises with Joseph Gordon-Levitt or Batman Beyond featuring Michael Keaton?
Whoever is playing the part, expect casting soon as the Joker origin is set to start filming in May. What this development does mean is that we could see other characters from The Dark Knight Trilogy appear.