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Status: In the works
Riverdale showrunner Roberto Aguirre-Sacasa is executive producing a brand new Pretty Little Liars series for HBO Max called PLL: Original Sin. It's set in the same universe as the Freeform show, but about a whole new group of people. Chilling Adventures of Sabrina writer Lindsay Calhoon Bring is writing the pilot, and the show has been given a straight-to-series order. Bailee Madison, Chandler Kinney and Maia Reficco are currently set to star.
Here's the series description:
"Twenty years ago, a series of tragic events almost ripped the blue-collar town of Millwood apart. Now, in the present day, a group of disparate teen girls—a brand-new set of Little Liars—find themselves tormented by an unknown Assailant and made to pay for the secret sin their parents committed two decades ago...as well as their own. In the dark, coming-of-RAGE, horror-tinged drama Pretty Little Liars: Original Sin, we find ourselves miles away from Rosewood, but within the existing Pretty Little Liars universe—in a brand new town, with a new generation of Little Liars."