A Merged Super-Warrior Is Born: His Name Is Gotenks!!
In the realm of the Supreme Kais, the newly freed Elder Kai offers a unique method to unlock Gohan's latent potential, though the unconventional strategy requires extreme patience. Meanwhile, back at Kami's Lookout, Goten and Trunks reach the climax of their training and attempt to perform the Fusion technique for the very first time, aiming to bring forth an unstoppable new savior.
Aired 23/11/2014EP 33 - A Merged Super-Warrior Is Born: His Name Is Gotenks!!
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.