Raditz
	He came to Earth to look for Kakkarot (Goku) and found that he had no memories of his past.  He came to Earth as strong as one of Saibamen that Nappa and Vegeta used, which is considered weak.  But he was still stronger than Goku and Piccolo.  It took a brief attack by Gohan and then a Special Beam Cannon by Piccolo while Goku held him.  The blast is strong enough to take out Raditz, but it also killed Goku when the beam blew holes through both of them (Messy!).