As Dabra retreats, promising a new warrior to take his place in the fighting, tensions run high between the Saiyans due to Gohan's inability to finish off the Demon King. Vegeta, in particular, has run out of patience.
"I am going to have a major B.F."
(A B.F. is a Bitch Fit.)
And B.F. Vegeta has, blaming Gohan's soft nature for the furthering of this, to his view, pointless game. At his wit's end, Vegeta begins to charge up a ki blast to make his way further down to where Babidi and Dabra wait with Majin Boo's containment ball. Kaioshin pleads with Vegeta to see reason, but it's only Goku who can calm him down. (Gay.)
Goku wonders what Dabra meant by finding a new suitable warrior for them to fight, and Kaioshin, looking over the Saiyans, cracks the admittedly all-too-obvious code.
(The mathematical marvel of the century.)
Pleased with Dabra's findings,
Babidi begins to channel his magic to take control of Vegeta's wicked heart.
And Majin Vegeta is born.
(And thus stand stiff a thousand fanboy erections.)
Babidi takes the Saiyans and Kaioshin and transports them to the Tenka-ichi Budokai arena for their fight. He commands his new servant to beat the energy out of Gohan and the rest, but Vegeta refuses. His fight is only with Son Goku. Despite having control over Vegeta's wicked heart... Babidi doesn't actually have control at all. But what the hell, Babidi figures this won't backfire on him at all.
... in front of everyone ...
... begins to attack Goku.
And in doing so, causes the deaths of a thousand Budokai fans.
"Just bein' a dick."