Other source:
To buy as much time as possible, Goku demonstrates the Super Saiyan transformations. He starts in his normal form, then goes to Super Saiyan, then Super Saiyan 2. He then transforms into Super Saiyan 3, and the immense power of this transformation rocks the entire planet. His hair grows down to his knees, and his eyes change. His power is so incredible that Gohan, Shin, and Kibito can feel it in the world of the Kais. As a Super Saiyan 3, he possesses even more power than Majin Buu. He starts to pound Buu with relative ease. At Capsule Corporation, Trunks and Dr. Brief frantically search for the Dragon Radar.
