Remember, not all sequels are bad. The Godfather Part II is one of the all-time great movies. Even the most recent Hunger Games was, to my mind, an improvement on its predecessors. Dune: Part One was so dull that Part Two must surely be better. On the whole, sequels tend to succeed when the original directors remain in charge. And so, with George Miller helming Furiosa, Ridley Scott back for Gladiator 2, and Tim Burton returning for Beetlejuice 2, we can keep our fingers crossed. Todd Philips’ Joker was one of the hits of 2019, but the director will have...