Finale Explained

The season finale of HBO's IT: Welcome to Derry sees the young Losers Club banish Pennywise to the sewers after a tense confrontation on Derry's frozen border. Executive producers Andy and Barbara Muschietti reveal connections to the original IT movies, including a key character's link to Richie Tozier and a cameo by Sophia Lillis as Beverly Marsh. The episode ends with a 'Chapter One' title card, hinting at a planned three-season arc.