From the hit anime series, Dragon Ball Super, comes Goku in his Super Saiyan 4 form. The only way Saiyan can attain Super Saiyan 4 is if they become a Golden Great Ape and regain conscious control over the form. Even after this form is attained, it cannot be accessed at will and requires exposure to Blutz Waves every time the user wishes to transform, however Goku is claimed to be a special case, capable of using the form whenever he wishes.