The Powering Up Continues? Super Gotenks is Achieved! (パワーアップは続く!?完成！超ゴテンクス！, Pawā Appu wa Tsuzuku !? Kansei! Sūpā Gotenkusu!) is the one hundred fortieth episode of Dragon Ball Z Kai. Its Japanese air date is December 7, 2014. Its American air date is November 18, 2017.
After completing his ceremony, Old Kai instructs Gohan to sit still for the next 20 hours in order to complete the power-up. Meanwhile, Goten and Trunks learn how to perform the fusion while in Super Saiyan form to become Super Gotenks. Gotenks' cockiness almost leads him to confront Majin Buu again, but he ends up retreating when the fusion time runs out. Elsewhere, Majin Buu inadvertently befriends a small dog after healing its injured leg, while Mr. Satan almost manages to convince Majin Buu to stop killing humans. However, a hunter looking to take down Majin Buu for himself relentlessly shoots the dog, which leaves Majin Buu shocked and infuriated.