Who is Werewolf by Night? Everything you need to know about the MCU hero and what it means going forward

At this year's D23 Expo, Marvel finally unveiled the official trailer for its Halloween special, Werewolf by Night. Directed by Michael Giacchino, not much is known plotwise but from the trailer, it looks to be a group of monster hunters fighting to find the werewolf among them. To a more casual fan of the MCU, you might be...