structural:reformatting, structural:scholar_edition, linguistic:paraphrasing
1984–1986: Ride the Lightning, Master of Puppets, and Burton's death

Metallica recorded its second studio album, Ride the Lightning, at Sweet Silence Studios in Copenhagen, Denmark, from February to March 1984. It was released in August 1984 and reached number 100 on the Billboard 200. A French printing press mistakenly printed green covers for the album, which are now considered collectors' items. Mustaine received writing credit for "Ride the Lightning" and "The Call of Ktulu".

Elektra Records A&R director Michael Alago and co-founder of Q-Prime Management Cliff Burnstein attended a Metallica concert in September 1984; they were impressed with the performance, signed Metallica to Elektra and made the band a client of Q-Prime Management. Metallica's growing success was such that the band's British label, Music for Nations, released " Creeping Death " as a limited-edition single, which sold 40,000 copies as an import in the U.S. Two of the three songs on the record – cover versions of Diamond Head's " Am I Evil? " and Blitzkrieg 's "Blitzkrieg" – appeared on the 1988 Elektra reissue of Kill 'Em All. Metallica embarked on its first major European tour with Tank to an average crowd of 1,300. Returning to the U.S., it embarked on a co-headlining tour with W.A.S.P. and support from Armored Saint. Metallica played its largest show at the Monsters of Rock festival at Donington Park, England, on August 17, 1985, with Bon Jovi and Ratt, playing to 70,000 people. At a show in Oakland, California, at the Day on the Green festival, the band played to a crowd of 60,000.

Metallica's third studio album, Master of Puppets, was recorded at Sweet Silence Studios from September to December 1985 and released in March 1986. The album reached number 29 on the Billboard 200 and spent 72 weeks on the chart. It was the band's first album to be certified Gold on November 4, 1986, and was certified six times Platinum in 2003. Steve Huey of AllMusic considered the album "the band's greatest achievement". Following the release of the album, Metallica supported Ozzy Osbourne on a U.S. tour. Hetfield broke his wrist while skateboarding; he continued with the tour, performing vocals, with guitar technician John Marshall playing rhythm guitar.

On September 27, 1986, during the European leg of Metallica's Damage, Inc. Tour, members drew cards to determine which bunks on the tour bus they would sleep in. Burton won and chose to sleep in Hammett's bunk. At around sunrise near Dörarp, Sweden, the bus driver lost control and skidded, which caused the bus to overturn several times. Ulrich, Hammett and Hetfield sustained no serious injuries; however, Burton was pinned under the bus and died. Hetfield said:

I saw the bus lying right on him. I saw his legs sticking out. I freaked. The bus driver, I recall, was trying to yank the blanket out from under him to use for other people. I just went, "Don't fucking do that!" I already wanted to kill the. I don't know if he was drunk or if he hit some ice. All I knew was, he was driving and Cliff wasn't alive anymore.