To avoid the Dragon Radar's destruction, Goku confronts Boo to give Trunks time to find it. When Goku escapes, Boo kills Bobbidi after tiring of being ordered around. Goku teaches Goten and Trunks the fusion dance, but he is forced to return to the afterlife, where he meets up with Gohan. Wanting to test the Z Sword, Goku accidentally breaks it, awakening an ancient Kaiō-shin who starts performing a 24-hour ritual to make Gohan stronger. Goten and Trunks succeed in performing the fusion dance and form a warrior called Gotenks (ゴテンクス, Gotenkusu), who still needs to train to defeat Boo. Mr. Satan goes to confront Boo, but instead becomes his friend and makes Boo swear that he will never kill people again. However, Boo's dog is shot by a bandit, causing him to create a thin Boo made up of his evil feelings that turns the obese one into chocolate. The thin Boo then eats the chocolate and transforms into a new, stronger Boo.