After years of being the most powerful warrior in the Universe, Goku finally meets his match in the powerful parasite, Baby. But adversity is nothing new to the Saiyan hero. With a little help from some old friends, Goku reaches the ultimate level of Saiyan power as he ascends to Super Saiyan 4! But Baby also has help during the battle. Bulma concocts a plan causing Baby to exceed the power of the Super Saiyan 4! With Goku facing the very real possibility of defeat, Old Kai intervenes with a risky plan that may be only a delay from the inevitable!