It's been clear for a while now that Gotham isn't adhering to the comic books in pretty much any respect but the show jumped the shark last night when it finally introduced The Joker. While the vast majority of fans theorised that Jerome would be revealed as the Clown Prince of Crime, it turns out that his twin brother Jeremiah is going to menace Gotham City as the terrifyingly insane villain.
After Jerome was finally gunned down by Jim Gordon in what appears to be a definitive death for the character, his promise that he had become more of a "concept" than a man proved to be correct when he left his twin a gift which had a devastating effect on him. Unleashing what appeared to be Joker Gas, we see Jeremiah rise with a pale white face and twisted smile; the transformation is complete!
His hair doesn't appear to be green - yet - and there are a few ways Gotham could still introduce another Joker but this is a rather weird and underwhelming origin story for the character if it is truly him (which does seem to be the case). Regardless, Jerome has succeeded in unleashing Jeremiah's madness and it should not be interesting to see where the series takes this story moving forward.