after dragon ball gt goku went with shen long to the dragon world to train for many years becoming very strong in his base form and unloking a power beyond ssj 4 after his resurection he fighted zaiko his third son mady of his blood and the suprem kai of the east during his arival to planet yardarat,zaiko was very strong and was iven stronger than goku ssj 4 and vegeta ssj 4