Gogeta
	Gogeta is formed when Goku and Vegeta do the fusion dance.  Gogeta didn't really appear much in the DBZ series.  He only appeared once and that was in movie 12, when Goku and Vegeta had to save hell from being taken over.      The fusion process was rather short, and Gogeta easily kicked the crap out of his nemesis, so there isn't much to say about him.      Later in the GT series, Gogeta returns as Goku and Vegeta fuse as SS4 to form Super Saiyan 4 Gogeta, the most powerful character in the DB series that was ever created.