Eventually, Goku discovers he needs to extinguish the Furnace of Eight Divinations to stop the flames, which leads to him encountering the furnace's guardian, Annin (and her protector, Grandpa Gohan).

While Grandpa Gohan has been dead since the beginning of the story and Dragon Ball fans were aware that Goku wasnt a normal human since he had a mysterious tail, the connection behind those two ...