Gottlieb/Nintendo worked on a Super Mario Bros. pinball machine all the way back in 1992, and that machine featured numerous voice clips for Mario. Mario doesn't sound quite like he does today, having a more subdued and lower voice. Just who provided the voice for Mario back then? Turns out it was Charles Martinet after all, but he wasn't credited in the game! It's obvious he was still finding his way with Mario's voice back then, which explains why it sounds somewhat different.