Question: What short story is a 2008 American science fiction film with the screenwriter who's most famous work is the screenplay for the film "The Last Castle" based off of ?
Sentence (from "Gort (The Day the Earth Stood Still)"): In that story, Gnut is a moving green statue that is apparently attendant upon Klaatu, but in the terminus of the story is identified as the eponymous "master" over Klaatu.
Relevant evidence: No