Goku and company travel to the Demon Realm to rescue Dende and regain their adult bodies. Supreme Kai explores the origins of his people and of Majin Buu, which the series ties to the Demon Realm. In the climax, Gomah wears the Evil Third Eye and reaches his Super Giant form. The child Goku, Piccolo and Vegeta cannot beat him, even with Super Saiyan 3 Vegeta and Super Saiyan 4 Goku. Glorio's wish to the Demon Realm Porunga returns everyone to adulthood.
Goku shows off Super Saiyan 3 in Episode 19 and uses Super Saiyan 4 and a Kamehameha in Episode 20. Piccolo's attempt to hit the Third Eye three times fails. Majin Kuu is swept up by the winds, lands on Gomah's back and hits the Evil Third Eye three times with the Book of Magic Items. He then appoints himself Supreme Demon King and makes Dr. Arinsu his Vice. The Majin brothers imprison Gomah and Degesu in a bottle for 99 years. In the final scene Goku finds Evil Third Eye merchandise, hinting at more to come.