This is exclusive to Saiyans and Half-Saiyans. If the Saiyan has enough control over their Great Ape form, they can achieve the Super Saiyan transformation while in their Great Ape form, the outcome is a Golden Great Ape, having as much power as a Super Saiyan 4. Their normal brown fur turns to the familiar golden colour we're use to seeing.

Power Multiplier: 500x Base Power Level