Gogeta

Gogeta

ゴジータ
Gogeta is the resulting fusion of Goku and Vegeta, when they perform the Fusion Dance properly. His voice is a dual voice that contains both Goku's and Vegeta's voices. Like his Potara Fusion counterpart, Vegetto, he is regarded as one of the most powerful characters in the Dragon Ball franchise.

(Source: Dragon Ball Wikia)