Pan and Giru are stuck on the Para Para Brothers spaceship heading straight for Cardinal Mutchy Mutchy and his demented regime. Meanwhile, Goku and Trunks pursue Pan to the planet. Can anything prepare them for the shock that is to come?

After Baby flees from defeat by the claws of the ape, Goku finally transforms into a Super Saiyan 4! With his power increased to its maximum, Goku sets out to find where Baby is hiding and finish him off for good. But with Bulma's help, Baby might just be able to find the strength inside his Saiyan host to bring himself up to, and even, Goku's power level!