Metallica is a famous heavy metal band that appeared in the South Park episode "Christian Rock Hard", in which they joined the boys in their strike against illegal music downloading. Drummer Lars Ulrich is also seen looking disappointed over not being able to buy a shark tank as the police chief shows the boys the consequences of illegal music downloading.
The band's lead singer, James Hetfield, performed the song "Hell Isn't Good" for South Park: Bigger, Longer & Uncut.