Brent Forrester (TVs THE SIMPSONS, KING OF THE HILL) has netted himself a writing gig on Nickelodeon Movies, Atmosphere Ent. MM and the Gotham Groups THE SPIDERWICK CHRONICLES, reports HOLLYWOOD REPORTER. Atmosphere's Mark Canton, Nickelodeon's Julia Pistor and Gotham ceo Ellen Goldsmith-Vein will produce. The film will be based on the five-part series written by Holly Black and illustrated by Tony DiTerlizzi, who will be serving as exec producers on the project. The story follows the adventures of the Grace children -- a 13-year-old girl and 9-year-old twin brothers in their new dilapidated estate, which is inhabited by goblins, griffins, fairies and trolls.