The recent Gotham episode "The Blind Fortune Teller" saw the introduction of the Flying Graysons to Gotham's continuity (no Robin yet, though, since he would still be a sperm at this point) - but, more importantly, it saw the introduction of The Joker (or, at least, a person who acts an AWFUL LOT like The Joker). His performance is a nice mix of Heath Ledger and Mark Hamill - too bad it's stuck on Gotham (at least they've gone a couple months without another plot as lame as "balloon murders").