The Great Ape transformation is thus potentially cataclysmic and greatly feared, it occurs when a Saiyan is exposed to the moon but can be countered if a Saiyan's tail is removed or if the moon itself is somehow destroyed.
Notable Great Ape Transformations
Powers / Abilities
this form has great strength and the ability to shoot powerful blasts from his mouth.
Vegeta and some saiyans can hold his conscincie during the transformation and even can talk.