The Secret of NIMH is a 1982 fantasy drama adventure adeptation of Robert C. O'Brien's 1972 novel, Mrs. Frisby and the Rats of NIMH. The film was directed by Don Bluth, and acts as his Directoral Debut. The movie was followed by a direct-to-video sequel The Secret of NIMH 2: Timmy to the Rescue, which was made with out Bluth's inpute, or consent.