IT: Welcome to Derry is a horror drama prequel to Stephen King’s IT, exploring the early days of Pennywise and the sinister history of Derry, Maine. Set decades before the Losers Club, the series follows residents who begin to notice strange disappearances and unsettling events tied to an ancient evil beneath the town. As the truth surfaces, the show expands the mythology of Pennywise while revealing how Derry became a place shaped by fear and tragedy.