By A Mystery Man Writer
Super Saiyan Goku (known as Super Saiyan Son Goku in Japan) is a powered-up transformation of Goku from the Dragon Ball series, which was first obtained by Goku during the Frieza saga of Dragon Ball Z. Originally a legend among the saiyan race, Goku was the first saiyan in over one thousand years to achieve the form during his battle with Frieza on the planet Namek, having been triggered due to intense feelings of anger and rage resulting from Frieza murdering Krillin. As the series progresses
Goku SSJ9 (Version MUGEN) by DanteAce69 on DeviantArt
Supreme Ken's Epic Battle and Leveling Up Against Goku - Video Summarizer - Glarity
Goku, MUGEN Database
Dragon Ball Super: BEYOND THE BATTLE Prologue & Trailer! Details in the first comment, be sure to read it! : r/dbz
TAMASHII NATIONS Dragon Ball Special Page
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Goku, MUGEN Database
Goku, MUGEN Database
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Why can Saiyans go Super Saiyan but not humans or other species? - Quora
TAMASHII NATIONS Dragon Ball Special Page