CBS Films has acquired a horror script entitled Hellfest from William Penick and Chris Sey. The screenplay is set in a Halloween theme park and features a costumed killer who begins killing patrons while unsuspecting, non-murdered customers assume it’s part of the show (silly customers). Per Heat Vision, The Walking Dead executive producer Gale Anne Hurd will produce Hellfest under her Valhalla Entertainment label. Penick and Sey developed their script based upon an original concept from Valhalla’s Ben Roberts who will executive produce the film. The co-scribes previously penned Secrets in the Walls, a television horror title that aired on Lifetime.