"Metal Crusher" was composed by Toby Fox for Undertale. It plays during the battle against Metatton in his box-like form in Hotland. The track is also quoted in "Death by Glamour", Metatton EX's battle theme, alongside other tracks related to the character.
An unnamed track known as "grandpasemi.ogg" (and later "grandpatemi.ogg" in the game files) included in the Undertale demo has a melody similar to the intro of "Metal Crusher"
There are 10 rips of "Metal Crusher" on the SiIvaGunner channel. The first rip of "Metal Crusher", "Metal Crusher (Beta Mix) - Undertale", was uploaded to the GiIvaSunner channel on March 10, 2016. After the GiIvaSunner Termination, it was reuploaded to the SiIvaGunner channel on July 26, 2016.
"Metal Crusher" has also been used in a handful of rips, mostly in melody changes and medley rips alongside other Undertale tracks.