La mystérieuse réapparition de Dendé

Realizing that he's totally outmatched, Buu decides to self-destruct, hoping to take Gohan with him. Gohan escapes before Buu explodes, and he takes the others with him out of the blast radius. Afterwards, there is no sign of Buu, but Gohan knows that he's still around. They suddenly detect Dende's energy signal, and they go to find him. On the way, they pick up Hercule Satan and the dog, Bee. Dende explains that as Buu was escaping through the inter-dimensional hole, Mr. Popo threw him from the lookout, because without Dende, there would be no Dragon Balls to grant the wishes they intend to use to reverse all the damage. Buu tracks them down, but instead of having a rematch with Gohan, he calls out Goten and Trunks. (Source: Wikipedia)