EXCLUSIVE: In a preemptive buy, Fox has given a pilot production commitment to Greatest American Hero, a single-cameRick Famuyiwara comedy inspired by Steven J. Cannell’s 1981 cult classic. It hails from Dope writer-director Rick Famuyiwa, Phil Lord & Chris Miller– the directing duo behind the successful Fox logofeature franchise based on another ’80s TV series by Cannell, 21 Jump Street — and Cannell’s daughter, television director Tawnia McKiernan. 20th Century Fox TV, where Lord and Miller are under an overall deal, is the studio.