Goku and Vegeta reunite the others only to be attacked by Majin Buu! The showdown proves that fighting Buu inside his own head is a mind-bending experience. Can Goku and Vegeta survive in this twisted house of horrors where all is Buu?

After the chords of attachment to the roly-poly Buu are cut by Vegeta, Majin Buu should mutate into a much weaker form. But instead he gets even stronger! This baffles everyone but Kibito Kai, who discloses Majin Buu's bizarre history!