Castle Rock is a fictional small town which is featured prominently in a number of Stephen King works. It is first introduced in The Dead Zone, where unwilling psychic Johnny Smith is drawn into the search for a murderer. The man in question, when discovered, is none other than... well, you don't want me to spoil it, do you?
Anyway, Castle Rock's Sheriff Bannerman, having recovered from this unmentioned incident, later reappears in Cujo, which takes place entirely in the town. Following this, The Dark Half, The Sun Dog and Needful Things all take place within the boundaries of this rather beleaguered location.
Thankfully, the residents of Castle Rock can breathe a sigh of relief: Needful Things was subtitled The Last Castle Rock Story, and although references to the town pop up in Gerald's Game, Bag Of Bones and King's latest (massive!) Under The Dome, a rewrite of It Grows On You from the short story collection Nightmares And Dreamscapes forms the final glimpse of Castle Rock as a main location.
Castle Rock Entertainment is also the film company that has produced several Stephen King adaptations: Misery, Hearts In Atlantis and Dreamcatcher being notable successes. Despite the name, a homage chosen after success with Stand By Me (based on the novella The Body), Castle Rock Entertainment does not exclusively work on King movies. Television programmes like Seinfeld were a part of Castle Rock Entertainment's output, and other successful films including When Harry Met Sally and A Few Good Men, were also produced by the company.