Pennywise the clown in Stephen King’s It returns on a roughly 27-year cycle, with the story setting spanning several decades and the creature resurfacing after each long sleep. In the original novel, the cycles vary a bit (sometimes shorter than 27 years, sometimes longer), but the commonly cited figure for the recurring terror is about 27 years between resurgences. In film and TV adaptations, the timing is typically aligned to about 27 years between appearances, though the exact dates can shift slightly depending on the timeline chosen by the adaptation.
