Yu-Gi-Oh! episode 205: "Birth Of The Blue-Eyes"
After his hunger was satisfied, he said that now that he is full he can "grant your wish" and when he finally took them to the Pharaoh's tomb he vanished and seemed to know a lot more about the situation than he was first implied to.
He is a mysterious NPC in the Dark RPG. The gang meets him in the memory world, and helped find the Pharaoh when he was missing, and took part in several of their plans. In a failed attempt trying to look for the Pharaoh's name in the palace, he asked the gang for food, which they did, then he took them to the Pharaoh's tomb, where the Pharaoh's name is.