Evil Vegeta is Vegeta as a Super Saiyan 4, but when he changed to that form, he changed and his hair color became black and he seem to be angry at every one. Goku called him Evil Vegeta that's how he got his name. He can use X10 Kaio-ken and Kamehameha without losing power. He destroys towns for the fun of it. Once Goku asked him why he does it and Vegeta said, "Because I can't pay my rent." Then Goku says how Bulma has so much money then Vegeta says, "Oh."