Delay Majin Boo: The Limit! Super Saiyan 3!!
When Babidi's path of destruction targets a critical location, Trunks breaks away from training to execute an urgent errand. To buy him enough time to complete the mission, Goku steps forward to stall Majin Buu, unleashing an unprecedented display of Saiyan power that shakes the world. Meanwhile, far from the battlefield, Mr. Satan vows to step in and handle the monster himself.
Aired 19/10/2014EP 28 - Delay Majin Boo: The Limit! Super Saiyan 3!!
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.