|"The Great Transformation on a Moonlit Night! The Secret of Gohan's Power"|
|Rōmaji||Tsuki no Kagayaku Yoru ni Dai-Henshin! Gohan Pawā no Himitsu|
|FUNimation||Gohan Goes Bananas!|
|Corresponding edited Z episode||DBZ005 (Edited)|
|Corresponding Kai episode(s)||DBK005|
|Manga||Chapters #208 & #209|
|Japanese||June 21, 1989|
|English||June 27, 2005|
"The Great Transformation on a Moonlit Night! The Secret of Gohan's Power" (月の輝く夜に大変身！悟飯パワーの秘密, Tsuki no Kagayaku Yoru ni Dai-Henshin! Gohan Pawā no Himitsu; FUNimation "Gohan Goes Bananas!") is the eighth episode of the Dragon Ball Z anime.
As Kuririn and the others try to find the Dragon Balls after Bulma adjusts the eyepiece for their use. Chi Chi arrives with her father to search for Gokū and Gohan, there Nuten Rōshi is forced to tell Chi Chi the truth himself, to which she faints. Yajirobe appears with a task for Kuririn: he must bring Yamcha, Tenshinhan, and Chaozu to Karin Tower in preparation for the Saiyans' arrival, before he leaves he also tells them that Uranai Baba is coming to tell them that Gokū wishes to be brought back just before the Saiyans' arrival. Meanwhile, at night, Gohan sees the full moon for the first time and goes through the same transformation as his father once did: he becomes a giant ape-like creature, a Giant Monkey, unable to control his power. With no other way to stop the rampaging Gohan, Piccolo is forced to destroy the moon. Gohan reverts to his normal, naked form, and with no moon, the chance of the transformation ever happening again is gone. Just to be safe, Piccolo pulls Gohan's tail off before giving him new clothes with his symbol on it and a sword. Finally, Piccolo again leaves Gohan by himself.