Ep. 37: Böser Buu besiegt und absorbiert Buu und begibt sich dann zum Palast von Kami, um Gotenks herauszufordern.

37

Buu attempts to fight against the Evil Buu, but out that finds he is much weaker, as most of his power had been transferred over to his evil side. As such, Evil Buu manages to reflect Buu's candy attack back at him, turning him into chocolate before eating him and gaining his power, giving him a more complete form. Sensing the energy of Piccolo and the others, Evil Buu arrives at Kami's Palace, demanding to fight against Gotenks. Piccolo attempts to stall for time by telling Evil Buu to wait until all earthlings are killed, instructing Krillin to bring Goten and Trunks to the Hyperbolic Time Chamber to make use of what little time they have. (Source: Wikipedia)