The cover of Master of Puppets, conceived by the band and Peter Mensch and painted by Don Brautigam, depicts a graveyard with white crosses connected by strings, manipulated by hands emerging from a red, cloudy sky, with an orange glow on the horizon. The album, with a total duration of 54 minutes and 52 seconds, was released on March 3, 1986. Instead of previewing the material with singles or videos, Metallica embarked on a five-month tour of America supporting Ozzy Osbourne. Tragically, during the album's support tour, on September 27, 1986, the band's bus was involved in an accident near Dörarp, Sweden, in which Cliff Burton died. The European leg of their own tour was canceled, and the band returned home to find a new bassist.
Master of Puppets reached number 29 on the Billboard 200 chart and was met with great critical acclaim, which praised both the music and the politically charged lyrics. It is considered a defining work in the development of American thrash metal. In 2025, it was certified 8x platinum by the Recording Industry Association of America (RIAA) for sales of eight million copies in the United States, and also received platinum certifications in Canada and the United Kingdom. Particular recognition came in 2015, when Master of Puppets became the first metal recording selected by the Library of Congress for preservation in the National Recording Registry, highlighting its cultural, historical, and aesthetic importance. In 2017, the album was remastered and reissued in an expanded edition.