Dragon Ball ZEdit
Enjoying a peaceful life on the World of the Kai with his fellow Supreme Kais, East Supreme Kai was unaware until too late that he and the other Supreme Kais had been targeted and marked for death by the ruthless wizard Bibidi, who was determined to wipe them out by unleashing his fearsome monster, Majin Buu, on them all.
After hearing that Northern and Western Supreme Kais had been killed by Kid Buu, Eastern Supreme Kai and Grand Supreme Kai prepared to face off against the buffed-up monster (Kid Buu had absorbed Southern Supreme Kai and transformed into what is known [by fans] as Buff Buu or Ultra Buu). While "Kid Buu" was after Eastern Supreme Kai, Grand Supreme Kai intervened, but was absorbed by Ultra Buu. But Ultra Buu turned into an obese, childlike monster, and to his relief, Supreme Kai was spared by Majin Buu, whose evil had been reduced thanks to Grand Supreme Kai's good nature.
To avenge his friends, Supreme Kai eventually caught Bibidi off guard and destroyed the evil wizard while Majin Buu was locked up in a ball. Supreme Kai then hid the ball deep under the surface of the Planet Earth, fearing that he would be powerless to stop Majin Buu himself.
Supreme Kai then returned to the Sacred World of the Kais, aided by a new bodyguard, Kibito, to carry on with his life of peace. Due to the deaths of the other four Supreme Kais, Eastern Supreme Kai became known simply as the Supreme Kai. Although the title of "Grand Supreme Kai" was never officially given to him, he assumed the duties there of.