Warning: FULL SPOILERS follow for Castle Rock Season 1, Episode 6, titled “Filter.” Castle Rock was renewed for Season 2 earlier this week.

The Stephen King Universe just got a whole lot bigger in Castle Rock Episode 6, with a reveal that hints to a possible Dark Tower connection.

For those uninitiated in the Kingverse mythology, the Dark Tower (also the name of an 8-part book series) is the center of the Stephen King multiverse and serves as the metanarrative that ties together and separates the individual realities of the Stephen King universe. Within that multiverse are doorways, both magical and mechanical that can transport a person to “other heres 

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Source: IGN.com Castle Rock's Dark Tower Connection Revealed