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"Welcome to Derry," a prequel series to Stephen King's "It," explores the origins of Pennywise in the 1960s.

The new horror series will premiere on HBO Max on Sunday, Oct. 26.

Viewers can stream the series by adding HBO Max to a Sling TV subscription.

Just in time for spooky season, you can watch the premiere of "It" prequel series "Welcome to Derry."

Based on Stephen King's novel "It," the new horror-drama series focuses on the origins of Pennywise and the town's cursed history in the 1960s.

The series stars Bill Skarsgård, reprising his role as Pennywise from It and It Chapter Two, along with Taylour Paige, Jovan Adepo, Chris Chalk, James Remar, Stephen Rider, Madeleine Stowe, Rudy Mancuso and more.

Here's how to watch Welcome to Derry on Sling with HBO Max

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