IT: Welcome to Derry (2025, showrunners Jason Fuchs and Brad Caleb Kane)

Prequel to IT beginning in 1960s, also covering origins of Pennywise the Clown.

In other words, welcome to the IT show.

https://www.themoviedb.org/tv/200875-it-welcome-to-derry

Editor's note -- HBO took down the video at the original link ( https://www.youtube.com/watch?v=6HG-wsRsg8s ), so this link is being replaced with a common content reposter.