Rush Straight to the Catastrophe! The Time Limit is One Hour!!
Arriving at Kami's Lookout, the terrifying new Majin Buu demands an immediate confrontation, forcing Piccolo to deploy a high-stakes delay tactic to stall the creature's murderous intent. Meanwhile, far away in the Sacred Realm of the Kais, Gohan's frustration reaches a boiling point as Elder Kai's tedious and unconventional training process tests the young warrior's patience to its absolute limit.
Aired 28/12/2014EP 38 - Rush Straight to the Catastrophe! The Time Limit is One Hour!!
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.