Special Training Completed! You're Finished Now, Majin Buu!!
With time rapidly running out, Piccolo's fragile delay tactic finally reaches its breaking point as the impatient monster demands his promised opponent. Forced to act, Piccolo leads the terrifying threat directly toward Goten and Trunks, setting the stage for a high-stakes showdown while the young Saiyans make their final preparations.
Aired 11/01/2015EP 39 - Special Training Completed! You're Finished Now, Majin Buu!!
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.