|"The Secret Plan to Defeat Boo — Its Name is Fusion!"|
|Rōmaji||Bū o Taosu Hisaku Sono Na wa Fyūjon!|
|Saga||Majin Buu Saga|
|Corresponding uncut Z episode(s)||DBZ239 & DBZ240|
|Japanese||September 21, 2014|
"The Secret Plan to Defeat Boo — Its Name is Fusion!" (ブウを倒す秘策 その名はフュージョン！, Bū o Taosu Hisaku Sono Na wa Fyūjon!) is the one hundred twenty-second episode of the Dragon Ball Kai anime.
Bulma's group goes to seek out the Dragon Balls so they can revive all the spectators that Vegeta killed, coming up against a large dragon whilst trying to get the last one. Meanwhile, as Piccolo and Kuririn as they leave Goten and Trunks in the care of Dende and Mister Popo, they are soon joined by Gokū, who learns about the situation. Gokū states he isn't strong enough to defeat Boo, but mentions having learned a technique known as Fusion, in which two similarly built fighters can merge together to become a single powerful fighter. Though he had originally planned to do this himself with either Gohan or Vegeta, Gokū realizes from Mister Popo that he can instead teach this technique to Goten and Trunks, due to their similar size.
|Son Goten||Masako Nozawa|
|Kame Sennin||Masaharu Satō|
|Artificial Human No. 18||Miki Itō|
|Mister Popo||Yasuhiko Kawazu|
|Babidi||Bin Shimada||Kōzō Shioya|
|Chicken Lizard||Sōta Arai|