The Secret of NIMH 2: Timmy to the Rescue is a 1998 direct-to-video animated film produced by MGM Animation and the sequel to the 1982 animated film The Secret of NIMH. In the film, Timothy Brisby, the youngest son of Jonathan and Mrs. Brisby, goes to Thorn Valley wanting to become a hero like his father. Martin becomes corrupted and evil (although not by choice), and Timothy must confront him in order to save the Rats. At Thorn Valley, Timothy learns from a young girl mouse that the mice who were presumed to have been killed during the escape from NIMH are still alive, so he and the rats mount a rescue operation. it was rereleased in 2014 in Theaters in 3D.

 The film, although a sequel, was created without Don Bluth's support or input. The film is unrelated to Rasco and the Rats of NIMH, the sequel to the book on which the original film was based. It is also considered an abomination due to poor animation, musical, characters and plot as well, which only die-hard NIMH fans can experience easily.