Crystal Beast Emerald Tortoise, known as Gem Beast Emerald Tortoise in the Japanese version, is a character version of the card, "Crystal Beast Emerald Tortoise".
He appears in Yu-Gi-Oh! GX as one of Jesse Anderson's Duel Monster Spirits. While Jaden was Dueling Yubel-possessed Jesse, Topaz Tiger and the other Crystal Beasts contacted him with the help of Winged Kuriboh. He watches as Sapphire Pegasus explains how to free Jesse.