Creepy Full Trailer for HBO Max's 'IT: Welcome to Derry' Horror Series"Something bad's coming..." HBO Max has finally unveiled the creepy full official trailer for IT: Welcome to Derry, a brand new horror spin-off series based on the two IT movies from 2017 & 2019. The director of the movies, Andy Muschietti, developed this with his sister, Barbara Muschietti. 🎈Here's the main official trailer (+ posters) for HBO Max's series IT: Welcome to Derry, from YouTube:You can rewatch the initial trailer for HBO Max's IT: Welcome to Derry series right here for the first look. IT: Welcome to Derry is a series developed by Andy Muschietti, Barbara Muschietti, Jason Fuchs. HBO will debut the IT: Welcome to Derry series streaming on HBO Max starting October 26th, 2025 coming soon this fall.