If you’re the kind of moviegoer who likes to be challenged by outrageous genre films and undiscovered gems that provide unique experiences, What the Fest!? might be just the festival you’ve been looking for. Creative director Maria Reinup and executive director Raphaela Neihausen have put together four days of programming at IFC Center meant to make you go, “What the —” The festival consists of ten films never before screened in New York City in addition to a sneak preview of the upcoming series The Terror starring Jared Harris, who will be on hand to talk about the project with executive producers Soo Hugh and David Kajganich. Opening night features the science lecture “Death by Thousand Bites” by biology professor Simon Garnier, followed by Coralie Fargeat’s debut thriller, Revenge, and a reception. Among the other presentations are the world premiere of Boiled Angels: The Trial of Mike Dana, followed by a Q&A with director Frank Henenlotter, comics legend Mike Dana, and producers Anthony Sneed and Mike Hunchback; the Scandinavian Gothic tale Valley of Shadows, followed by a Q&A with cowriter and director Jonas Matzow Gulbrandsen; The Endless, a twist on cults, followed by a Q&A with stars and codirectors Justin Benson and Aaron Moorhead; the Indonesian smash hit Satan’s Slaves, Joko Anwar’s horror remake; and the restoration of Marek Piestrak’s Estonian adventure flick Curse of Snakes Valley. What the Fest!? concludes Sunday night with Jenn Wexler’s teen-punk The Ranger, followed by a Q&A with Wexler and producer and costar — and low-budget master — Larry Fessenden.