The two developed ideas at a garage in El Cerrito, California, before inviting bassist Cliff Burton and guitarist Kirk Hammett for rehearsals. Lead vocalist and rhythm guitarist James Hetfield and drummer Lars Ulrich were the main songwriters on the album, already titled Master of Puppets. Metallica was motivated to make an album that would impress critics and fans, and began writing new material in mid-1985. During the summer, the band played the Monsters of Rock festival at Castle Donington, alongside Bon Jovi and Ratt to an audience of 70,000. After parting with manager Jon Zazula, Metallica hired Q Prime executives Cliff Burnstein and Peter Mensch. Elektra reissued Ride the Lightning on November 19, and the band began touring larger venues and festivals throughout 1985. The album caught the attention of Elektra Records representative Michael Alago, who signed the group to an eight-album deal in the fall of 1984, halfway through the album's promotional tour. The band's second album Ride the Lightning extended the limits of the genre with its more sophisticated songwriting and improved production. The album revitalized the American underground scene, and inspired similar records by contemporaries.

Metallica's 1983 debut Kill 'Em All laid the foundation for thrash metal with its aggressive musicianship and vitriolic lyrics. In 2015, Master of Puppets became the first metal recording to be selected by the Library of Congress for preservation in the National Recording Registry for being 'culturally, historically, or aesthetically significant.' It was certified six times platinum by the RIAA in 2003 for shipping six million copies in the United States, and was later certified six times platinum by Music Canada and platinum by the BPI. It is widely considered to be one of the greatest and most influential thrash metal albums of all time, and is credited with consolidating the American thrash metal scene. Master of Puppets peaked at number 29 on the Billboard 200 and received widespread acclaim from critics, who praised its music and political lyrics. The European leg was canceled after Burton's death in September 1986, and the band returned home to audition a new bassist. Instead of releasing a single or video in advance of the album's release, Metallica embarked on a five-month American tour in support of Ozzy Osbourne. The album's artwork, designed by Metallica and Peter Mensch and painted by Don Brautigam, depicts a cemetery field of white crosses tethered to strings, manipulated by a pair of hands in a clouded, blood-red sky, with a fiery orange glow on the horizon. Recorded in Denmark at Sweet Silence Studios with producer Flemming Rasmussen, it was the band's last album to feature bassist Cliff Burton, who died in a bus accident in Sweden during the album's promotional tour. Master of Puppets is the third studio album by the American heavy metal band Metallica, released on March 3, 1986, by Elektra Records.

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