The Extreme Confidence of Gotenks!! (ゴテンクス自信満々！！, Gotenkusu Jishin Manman!!; lit. "Gotenks Full Of Confidence!!") is the four hundred ninetieth chapter of the Dragon Ball manga.
Gotenks laughs off his first attack, claiming that he was not really trying before. This time, it is for real. He lunges forward again, coming up with original names for his punches and kicks. Eventually, Super Buu bats the boy away, and Piccolo is extremely embarrassed. Gotenks blusters some more, but Buu complains that this has not been fun yet. So the boy announces "Super Saiyan" and powers up. Piccolo comments on the fact that the Super Saiyan occurred after the start of fusion. Super Saiyan Gotenks is going to try again, but pauses while trying to decide which attack to use. He comes up with something that would unfortunately kill Buu after only one shot. Bowing to fate, Gotenks yells out "Galactic Donut!" and draws an energy ring in the air. The donut encircles Buu and tightens. The monster roars in pain. Then, he sneers and says "just kidding." Buu breaks free, and plays Gotenks like a soccer ball. The two bash heads, and Gotenks decides to try yet another fantastic technique. This time, it is the Super Ghost Kamikaze Attack. Buu is stunned, and Gotenks spits out an evil little ghost, the ghost says "Hi----i. I'm a ghost." Gotenks claims that he has won.