CBS Films has acquired Hellfest, a script by William Penick and Chris Sey about what happens at a Halloween theme park when one of the costumed characters is actually killing the patrons who think it's all part of the show. Gale Anne Hurd, who's currently producing the AMC series The Walking Dead, will produce the picture under her Valhalla Entertainment banner. The scribes wrote the script from a concept by Valhalla's Ben Roberts, who'll be executive producer. Deal comes after Hurd joined forces with Aspen comics on Dead Man's Run, a series that will be written by Greg Pak. In it, Hell is an underground prison for the reanimated deal, and a man enlists a team of the damned to escape and save his innocent sister's soul.