Tonight’s new episode is called “Ace Chemicals,” which means, at long last, we should be arriving at the point in the Batman story line in which a chemical accident results in the creation of the frozen-faced villain known as the Joker. But will it be Jeremiah, as played by Cameron Monaghan – who also has played Jeremiah’s now-dead (we think) twin brother, who finally ascends to Joker status by descending into that bubbling vat of chemicals? It should be, because as with The Big Bang Theory, we’re down to the final half-season, so anything can, and should, happen…