IT: Welcome to Derry expands the mythology of Stephen King's It by exploring earlier cycles of terror in the town of Derry, Maine. Bill Skarsgård returns as Pennywise, whose presence resurfaces across different eras, embedding fear and corruption into the community itself. The series emphasizes collective trauma and cyclical evil rather than a single hero's journey, maintaining a bleak, dread-driven horror tone.

Från IMDB:
In 1962, a couple with their son move to Derry, Maine just as a young boy disappears. With their arrival, very bad things begin to happen in the town.