Joe Stillman, one of the writers of "Shrek" and "Shrek 2," is going to adapt the upcoming kid-lit fantasy novel "Percy Jackson and the Lightning Thief" for Fox 2000. Maverick Films is producing. The book, due next year, is the story of a young boy in modern-day America who discovers he is the son of the Greek god Poseidon and must avert a deadly war between the gods in order to save his mother. Maverick's Guy Oseary and Greg Mooradian are acting as producers. Fox 2000 execs Carla Hacken and Erin Lindsey will oversee for the studio. Stillman is well known in the animated feature world. He is working on "Shrek 3," and his other credits include "Curious George" and "Beavis and Butt-Head Do America." He was a writer on the TV shows "Beavis and Butt-Head" and "King of the Hill." Stillman is repped by CAA.