Celtic Frost is an innovative and extreme Swiss heavy metal group, best known for their influence on the Black metal and Death metal genres. The band's frontman, guitarist and singer Tom Gabriel Fischer, changed his name to Tom Gabriel Warrior early in his career. With Steve Warrior on bass, he formed one of the earliest extreme metal bands, Hellhammer, in 1982. Steve Warrior was later replaced by Martin Eric Ain. The band attracted a small international fan base, got signed to Noise Records in Germany and recorded their debut EP Apocalyptic Raids in March of 1984.