Show No Mercy is the debut studio crusher by American thrash metal masters Slayer, originally released on December 3, 1983, by Metal Blade Records. Almost five months before Metallica released Kill ‘Em All, Metal Blade owner Brian Slagel saw Slayer open a show for Bitch at the Woodstock Theater in LA. Blown away, he asked the band if it would submit a track to his upcoming compilation album Metal Massacre III. They agreed and when he heard the song they turned in, "Aggressive Perfector," Slagel offered Slayer a record contract. On Dec. 3, 1983, the band released its scorching debut, Show No Mercy.
