There, Goku revealed to Alex that he was the chosen one, destined to carry on his legacy. Goku began to train Alex in the ways of the Z Warriors, teaching him powerful techniques and helping him to unlock the secrets of the Dragon Balls.
If you finish The Legacy of Goku and find yourself craving more, you are in luck. This game kicked off a highly successful trilogy. Its sequels, (covering the Android and Cell Sagas) and Dragon Ball Z: Buu's Fury (covering the Majin Buu Saga), fixed almost every mechanical flaw of the original game. They introduced multiple playable characters (like Gohan, Vegeta, Piccolo, and Trunks), better combat flow, and vast world maps.
The game kicks off at King Kai's planet and Master Roshi's island. You must rescue Gohan from Raditz.
You cannot become a Super Saiyan until you are level 35+ and have reached the final Frieza fight. When Frieza kills Krillin, an automatic cutscene triggers. From that point on, hold during battle to transform. Your attack power doubles, but your Ki drains constantly.