Martinet's video game voice over debut was as Mario in the 1995 Windows release of Interplay's game "Mario's FUNdamentals". However, most were first exposed to Mario's voice in the landmark 1996 game "Super Mario 64". He has voiced Mario, Luigi, Wario, Waluigi, Toadsworth, Metal Mario, Shadow Mario, Donkey Kong, MC Ballyhoo, Mini-Mario Toy, Baby Mario, Baby Luigi and Baby Wario in most games wherein these characters speak. He also voiced the enemiesWart, Mouser, Tryclyde, and Clawgrip in "Super Mario Advance". His voice work appears in the English and Japanese-language versions of the games, although his work is always in English (regardless of the Italian references whenever he voices Mario and related characters).