Their character details have yet to be revealed.
Andy Muschietti will direct multiple episodes of the series, including the first episode.
The two-film franchise amassed $1.17 billion worldwide.

(L-R) Taylour Paige, Jovan Adepo, James Remar and Chris ChalkGetty/Steve Schofield/Michael Buckner for Deadline
The series is set in the world of KingsItuniverse and expands the vision established by Andy Muschietti.
She is represented by CAA, Entertainment 360 and Granderson Rochers.
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Adepo was Emmy-nominated for HBOsWatchmenand recently starred in the Oscar-nominatedBabylonandThe Three-Body Problem.

He is represented by Powerline Entertainment, WME and Hansen, Jacobson, Teller.
Chalks credits include HBOsPerry Mason,All Dirt Roads Taste of Saltand FXsFeud: Capotes Women.
He is represented by Brillstein Entertainment Partners, Paradigm and Jackoway Austen Tyerman.
Remar recently starred in Christopher NolansOppenheimer, Francis Ford CoppolasMegalopolisandThe Noel Diary.
He is represented by Gersh and Lighthouse Entertainment.Welcome to Derryis produced byHBO Maxand Warner Bros Television.
Fuchs and Brad Caleb Kane will serve as co-showrunners on the project.
Shelley Meals, Roy Lee and Dan Lin also executive produce.