"Show No Mercy" is the debut studio album by American thrash metal band Slayer, released on December 3, 1983, through Metal Blade Records. This influential record consists of 10 tracks, showcasing Slayer's signature aggressive sound that would come to define the thrash metal genre. The album features fast tempos, intricate guitar riffs, and dark lyrical themes, which have become hallmarks of the band's style. Notable tracks include "Evil Has No Boundaries" and "Die by the Sword," both of which exemplify the raw energy and technical skill that Slayer is known for. With a runtime of approximately 36 minutes, "Show No Mercy" captures the essence of early 1980s metal, marking a pivotal moment in the evolution of speed and thrash metal. The album's production, handled by the band and producer Brian Slagel, contributes to its gritty sound, setting a precedent for future metal releases. "Show No Mercy" is considered a landmark album in Slayer's discography and a critical piece in the development of the heavy metal genre, influencing countless bands that followed.