In hell, Dr. Gero and Myuu creates Artifical 17. Artifical 17 comes from hell to fuse with Android #17, when they fused, they became Super android 17. Goku gets tricked into going to hell to fight Cell and Frieza, who was already dead. Without Goku, the earth is doomed. Piccolo, (who died in the Baby Saga) and Dende creates a portal so Goku can get out of hell. Goku later kills Super android 17.