The Heretiks world première at Fantastic Fest, 19th Sept 2026 “We’re all a little pagan,” 13-year-old Mabel (Ava Mae Seidensticker) tells her college-age sister Ada (Josie Juliette Wert), a little way into Gregg Bishop’s The Heretiks. Mabel has come home early from her Middle School, suspended for two days for turning up in full skull…
