"The Thing That Should Not Be" is a song by Metallica from the 1986 album Master of Puppets. It is featured in Guitar Hero: Metallica.
It is one of the easiest songs in the game. It is similar to "For Whom the Bell Tolls" as it repeats areas of the song frequently. The only part you should have trouble with is the solo, but other than that it is a simple song to pass and FC.