Invincible! The Ultimate Warrior Vegetto
Goku and Vegeta push past their longstanding rivalry to execute a final, desperate gamble against Majin Buu. Their unified stand gives rise to an extraordinary new fighter whose sheer presence immediately alters the balance of power on Earth. Refusing to be humiliated, the monster resorts to an unconventional and invasive tactic to strike at his new opponent from an unexpected angle.
Aired 29/03/2015EP 48 - Invincible! The Ultimate Warrior Vegetto
Dragon Ball Z Kai: The Final Chapters
Since Cell's defeat Gohan has grown up and go to the university then she meets Videl which who has some adventures, then both and his new brother Goten are training for the new tournament, in which Goku came back from the dead for one day. In half of the tournament a misterious persons advice the group about the resurrection of the dangerous Majin Boo, but all plans fails and every one try new ways to stop The dangerous Majin Boo who gets stronger each time. Goku and his friends make everything for stopping them through fights.
(Source: Anime News Network, edited)
Note: Remastered version of the Majin Boo arc that adheres more to the manga's story.