UPDATE 8/29: This story has been updated to include references and spoilers for Episode 1.08 - "Past Perfect."
Castle Rock isn't the first TV series based on a Stephen King story, but it's certainly the first TV series based on all of them. The new show, which airs Wednesdays on Hulu, takes place in the fictional Maine community of Castle Rock, where many of King's most horrifying stories took place, and where all of them seem to intersect.
Although Castle Rock tells an original story, the series is full of direct and indirect references to Stephen King's other stories, films, and even his real life. And while you can certainly enjoy the series without catching all of these Easter Eggs, it's a heck of a lot more fun to find those shout-outs while you're also enjoying the new plot and characters.