Which Metallica song does Eddie Munson play on guitar in the season 4 finale of "Stranger Things"?

The Metallica song Eddie Munson plays on guitar in the Stranger Things season 4 finale is “Master of Puppets.” Eddie performs it in the Upside Down as part of the group’s plan to distract the Demobats guarding Vecna’s lair.

Metallica released “Master of Puppets” as the title track of its 1986 album. The song was recorded in Copenhagen in 1985 and is known for its fast, intricate thrash-metal arrangement and lyrics about addiction and manipulation. Its release date also fits the show’s 1986 setting.

The sequence became one of the season’s signature moments. Eddie plays the song on an electric guitar, including its famous extended instrumental section, while Dustin helps carry out the wider plan. Eddie later sacrifices himself while fighting the Demobats, reinforcing the season’s theme of his growth from accused outsider to genuine hero.

The song is sometimes confused with other major Metallica tracks such as “One,” “Fade to Black,” or “Enter Sandman.” None of those is the song used in Eddie’s Upside Down performance. After the episode aired, “Master of Puppets” returned to music charts and introduced the track to a new generation of listeners.