Many subgenres of metal developed outside of the commercial mainstream during the 1980s. In the early 1990s the thrash metal genre achieved break-out success, mainly due to the massive success of Metallica's eponymous 5th album which was released in 1991 and brought thrash metal to the mainstream for the first time. Metallica's success was followed by Megadeth's "Countdown to Extinction" (1992) which hit number 2, Anthrax, Pantera, and Slayer cracked the top 10, and albums by regional bands such as Testament and Sepultura entered the top 100.