30Whether Great Apes Can Be Controlled Or Are Reckless
It’s funny to think that back in the days of the original Dragon Ball series, the Saiyan’s Great Ape transformation was the peak for the race. Provided that Saiyans have a tail, when they get a glimpse of the full moon (or a respectable substitute) they transform into giant
apes that gain a tremendous power boost, but they also give up their intelligence and free will and become reckless animals... Or do they.
Only the Saiyan Elite can control this form, which is why Vegeta can handle it, for instance. Additionally, even in Dragon Ball Super: Broly, Broly’s Great Ape form is uncontrollable because in spite of his strength, his family were still low-class Saiyans.