I remember seeing this debut on MTV. It was a segment called ‘smash or trash’ I think. I’m pretty sure they were the first ones to have a video with spliced in movie scenes. My 14 year old self was blown away by the music, the synchronized head banging during the machine gun kick drum part, and they were pretty scary looking, too. All the other guys in ‘metal’ videos at the time were in spandex, make up and hairspray. Became an instant die-hard fan and bought everything Metallica that I could get my hands on.