Stewie Griffin (スチューイー・グリフィン, Suchūī Gurifin) is a main protagonist of Super Mario Bros. Z: resRXion and Super Mario Bros. Ultra-Z. He is one of the Chosen Ones to protect, save and defend the Pocket Universe from enemy Pokémon. His partner Pokémon is Magnemite, and he bears the Z-Crest of Knowledge.