The Peaceful World Saga is the epilogue saga of Dragon Ball Z, taking place ten years after the end of the Kid Buu Saga. It is usually treated as part of the Kid Buu Saga, but was marked as a saga in its own right as part of Dragon Ball SSSS' 30th Anniversary Timeline. In Japan, it aired in January 1996 and it aired in the United States in April 2003.
Ten years after the defeat of Kid Buu in the Kid Buu Saga, many of the Z Fighters have made new changes. Bulma and Vegeta have a daughter named Bulla. Goten and Trunks have grown into strong teenagers. Gohan has become a scholar, is married to Videl and they have a daughter named Pan. At the World Martial Arts Tournament, the Z Fighters meet a ten-year-old boy called Uub. This boy is the reincarnation of Kid Buu, born from the wish Goku made before killing Kid Buu. Goku asks Majin Buu to change the numbers so Goku would be matched with Uub. Goku and Uub begin to fight and it is clear that Uub has great potential. As they fight, Goku mocks Uub several times to see his true potential, which works. Goku cuts the match short by suggesting he train Uub. Goku asks Uub if after he is trained they can have a rematch.
Uub agrees and Goku feels excited, with the challenge and with the chance to become stronger. Before leaving once again, Goku bids farewell to his family and friends, and tells Vegeta that he looks forward to another fight. Although the tournament is technically suspended because Goku and Uub did not finish their match, Trunks, Goten and Pan spar, with Pan defeating Goten, and Trunks holding her arm in victory. The series ends with Goku and Uub flying towards their destination, but the story is continued in the Black Star Dragon Ball Saga of Dragon Ball GT.
Anime and Manga differences
In the manga, Pan never fights Goten.
Also, in the manga, Goku never says goodbye to Goten, Trunks, Pan and Vegeta.