In 'Dragonball GT' this is the fourth level of a Super Saiya-jin. It is characterised by reddish fur growing over the body, and the person's hair becoming longer and shinier, also an incredible source of power that allows the person to perform the Juubei Kamehameha.
Gokou and Vegeta both attained the Super Saiya-jin 4 (SSJ4) form. When they fused they created SSJ4 Gogeta.
by Ash_K May 03, 2004