Golden Oozaru is a powerful transformation in the Dragon Ball series that occurs when a Saiyan with a tail transforms into a giant golden ape after absorbing the energy of Blutz Waves, typically from a full Earth or artificial moon. This form is stronger and more formidable than the standard Oozaru (Great Ape) transformation and serves as a critical stage in the process of achieving Super Saiyan 4. Golden Oozaru plays a significant role in Dragon Ball GT, especially during Goku's battles against powerful foes.