Special Training Completed! You’re Finished Now, Majin Buu!! Dragon Ball Kai: Doragon bôru kai : Season 6 Episode 4

Piccolo continues to lead Evil Buu to the Time chamber, when Goten and Trunks train hard to avenge the loved ones that they have lost. After rerouting Buu through Kami's palace, due to Buu being extremely unhappy and throwing tantrums every now and then, Piccolo takes Buu to the Time chamber, and Gotenks fights Buu after a warm-up round and playing around.