Attached Link: http://www.celtoslavica.de/chiaroscuro/films/thing/the_thing.html

Actually, hauksdottir, the original story for the movie was NOT titled "Who Guards Those Who Guard Themselves?" (sometimes paraphrased as "Who Guards the Guardians Themselves?" or "Who is Guarding the Guards?"). The film was based on the story "Who Goes There?" by Don A. Stuart, aka John W. Campbell Jr. By the way, you even got the quote wrong. It's "Qui custodiet IPSOS custodes?" -jjsemp