Well thankfully, this very question was answered in a long-forgotten TV special, named Episode of Bardock. In it, he was seen unlocking his Super Saiyan form to fight a villain named Chilled ...

Dragon Ball: Episode of Bardock acts as a sequel to Bardock: Father of Goku, where the blast of Freiza blowing up Planet Vegeta actually knocks Bardock into the past. This establishes what has to ...

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