Dragon Ball Z Episode 242, "Learn to Fuse!", initiates the training of Goten and Trunks in the Fusion Dance to combat Majin Buu, while Gohan begins training with the Z Sword on the Sacred World of the Kai. This pivotal episode focuses on the transition of power to the young Saiyans and the preparation for the Fusion Saga's climax. You can watch the series on official streaming platforms like Crunchyroll or Hulu.