A giant castle in a mysterious world. Two shady Majin, Gomah and Degesu, watch a monitor. The monitor shows Goku and the others having a fierce battle against Majin Buu. Gomah and Degesu head to Earth to execute a certain conspiracy.

Goku, Supreme Kai, and Glorio head out to the "Demon Realm" first. Their plane travels through space and a mysterious dimension. They arrive at the entrance to the Demon Realm, the "Third Demon World"!

The masked Majin who appeared before Goku and his companions is a young girl named Panzy! While Glorio gives her the cold shoulder, Panzy insists on acting as their guide. The group reaches a suspicious castle!

After encountering the Gendarmerie, the wardens of the Demon Realm, the four are forced to camp in a cave where they encounter further trouble! The enigmatic Glorio unleashes lightning magic against Goku to resolve the situation!

Goku and his companions arrive at the mystic Second Demon World where a giant ocean spreads as far as the eye can see! The party is amazed at the new world but is immediately attacked by Gendarmerie that have been sent by Gomah!

Having regrouped with Vegeta and the others, Goku and his companions arrive at a planet that seems familiar. As they move to head out, a suspicious shadow approaches! It's the Legendary Namek who remained alone in the Demon Realm!

As Goku and his companions head to where Gomah is, engine trouble causes them to land on a certain planet. The place they land happens to be a surprise-filled planet where even Supreme Demon Kings are afraid to tread!

To stop Goku's advancement, Gomah commits an unbelievable taboo! Goku and his companions can no longer proceed. Just when it seems their adventure is over, a certain someone reveals their true power!

The Evil Third Eye offers absolute power in the Demon Realm. King Gomah confirms its location and moves to obtain it! Will the Third Eye open on Gomah's forehead?!

Goku and his companions finally reach Gomah's palace. But Kadem and the mighty Gendarmerie Force bar their way! Meanwhile, in the palace, Degesu takes action for his own ambitions!