Les boucles magiques

Elder Kai tells Shin and Kibito to try a fusion with their earrings, but only after they fuse together does he reveal that it is a permanent fusion. Dende heals Gohan's injuries, so to prevent this from happening again, Buu creates a giant energy ball and aims it at Dende. Just before it hits, it is blasted out of the way by Tien's tribeam, who has arrived just in time. Buu tries again, but Goku suddenly appears and sends a disk of energy at the monster. It cuts off his legs and part of his head. His legs give Tien a crushing kick, and then return to Buu. Goku throws Gohan the other earring, but his aim is off. Goku goes Super Saiyan 3 to hold off Super Buu while Gohan serches for the earring. Suddenly, Gotenks' fusion wears off, and Buu loses most of his power. To make up for this, the part of Buu's head that was cut off suddenly engulfs Gohan, just like Piccolo and Gotenks. He merges with Gohan, and is now even more powerful than before.

(Source : Kitsu.)