Question: do goku and vegeta fuse?
Answer: The Fusion Dance is also used in Dragon Ball GT, when Goku and Vegeta fuse into Super Saiyan 4 Gogeta to fight Omega Shenron, though the fusion wears off before Gogeta can destroy him. In Dragon Ball Z: Budokai 2, Yamcha and Tien Shinhan can do the Fusion Dance and become Tiencha.