Birth of a Merged Superwarrior His Name is Gotenks!

is the one hundred thirty-first episode in Japan and the one hundred thirty-eighth episode internationally of Dragon Ball Z Kai. This episode first aired in Japan on November 23, 2014. Its original American airdate was November 4, 2017.
==Summary==
After some dubious persuasion from Goku, Old Kai reveals he has the ability to draw out someone's true power beyond their limits. This turns out to be a lengthy process that can take over a day to complete. Meanwhile, Goten and Trunks try out the Fusion Dance for real, but an error in the Fusion Dance results in the merged fighter, Gotenks, ending up with a failed transformation. After another failure, Goten and Trunks eventually perform a successful fusion and transform into the true Gotenks. Gotenks is confident that he can defeat Majin Buu with his current power level. He goes off in search of Majin Buu despite Piccolo's warnings.
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