In 1985, the German band Kreator released their debut album Endless Pain and the Brazilian band Sepultura released their EP Bestial Devastation. Overkill and Megadeth, the latter of which was formed by former Metallica guitarist Dave Mustaine, released their debut albums Feel the Fire and Killing Is My Business... and Business Is Good! respectively, and Anthrax released the critically acclaimed Spreading the Disease in 1985. Several other debut albums associated with the thrash metal genre were released that year, including Seven Churches by Possessed, To Mega Therion by Celtic Frost, and Energetic Disassembly by Watchtower; the first two are often credited for pioneering and popularizing the mid-1980s extreme metal scene (as well as the then-developing genres of death metal and black metal, respectively), while the latter has been cited as the first progressive/technical thrash metal album. From a creative standpoint, the year 1986 was perhaps the pinnacle of thrash metal, as a number of critically acclaimed and genre-defining albums were released. Metallica's major label debut Master of Puppets was released in March, becoming the first thrash album to be certified platinum, being certified 6× platinum by the Recording Industry Association of America (RIAA); it would be the band's last album to feature bassist Cliff Burton, who was killed in a bus accident six months after its release. Kreator released Pleasure to Kill in April 1986, which would later be a major influence on the death metal scene. Megadeth released Peace Sells... but Who's Buying? in September, an album which proved to be the band's commercial and critical breakthrough and which AllMusic later cited as "a classic of early thrash". Slayer, regarded as one of the most sinister thrash metal bands of the early 1980s, released Reign in Blood in October, an album considered by some to have single-handedly inspired the death metal genre. Also in October, Nuclear Assault released their debut album Game Over, followed a month later by Dark Angel's Darkness Descends, which marked the debut of renowned drummer Gene Hoglan. Flotsam and Jetsam's debut album Doomsday for the Deceiver (released on the Fourth of July in 1986) received some attention as well, due to the album being "the first of only a handful" to ever receive a 6K rating from Kerrang! magazine, and it is also notable for featuring a then-unknown Jason Newsted, who, not long after the album's release, joined Metallica as Burton's replacement. Also during the