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"A Secret Plan to Defeat Buu! Its Name is Fusion" (ブウをたおさく そのはフュージョン! Bū o Taosu Hisaku Sono Na wa Fyūjon!, lit. "The Secret Plan to Defeat Boo — Its Name is Fusion!") is the one hundred twenty second episode in Japan and the one hundred twenty-ninth episode internationally of Dragon Ball Z Kai. This episode first aired in Japan on September 21, 2014. Its original American airdate was August 19, 2017.


As Majin Buu destroys cities, Bulma and the others gather the Dragon Balls in order to resurrect the audience members killed by Vegeta. Learning that the last ball is on a solitary island in the middle of a lake, they rush there. After a difficult struggle, they steal the Dragon Ball from the island monster that had it! Meanwhile, at the Lookout, having brought Goten and Trunks there, Piccolo and Krillin wrack their brains to think of some counter-plan. Goku arrives there as well and is healed by Dende. Goku suggests the merging technique Fusion, which he learned from the Metamorans. It is a technique where the power of the two who merge has to be equal, so they decide to teach it to Goten and Trunks.

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