HBO's Watchmen is interested in a lot of subjects, but the one thing it won't be bothered to do is hold your hand. Damon Lindelof's sequel/"remix" to the landmark comic book series by Alan Moore and Dave Gibbons wastes zero time throwing you into the realness, which means it also doesn't work to catch you up on the events of the graphic novel. Fear not! We've got a full rundown of everything you need to know right here, but the most important bit to focus on is the Earth-shattering ending. And if the …