is a Saiyan form present only in the anime sequel Dragon Ball GT, and it has never been mentioned or hinted in the manga at all. The only way a Saiyan can attain Super Saiyan 4 is if he is already a Super Saiyan, can transform into a Golden Great Ape and regain conscious control over the form. This transformation is the ultimate combination of both the humanoid Super Saiyan and the Golden Great Ape. After this form is attained once, it can be accessed at any point.
