Daboria

Daboria is the fusion of Dadoria and Zarbon. How, well it is stated in the Frieza saga of DragonBall Z that Zarbon and Dadoria's power are equal. (if you don't count Zarbon's second form) And since they were in the world trade organization, and since Goku was dead when he learned of the fusion dance technique by the Metamorans, which was between the Cell and Buu sagas, which takes place years after the Frieza saga, who's to say that the Metamorans wern't a planet that they termenated. It Was. But before Zarbon did away with their leader, he ordered him to teach Dadoria and himself his most valuable technique, which in terms were the fusion dance. So, while in hell, they perform it correctly and make Daboria. Daboria then breaks out of hell uknowingly, and in The Adventures of Goten and Trunks, he goes to earth to get revenge on Vegeta, the one resposible for his seperated entities death. Only to find out that he is no longer living.