Piccolo was once Goku's enemy, but teamed up with him to defeat Raditz, since he stood in the way of Piccolo's own plans of world domination. Piccolo is from the planet Namek, and his counterpart Kame is the guardian of Earth and creator of the Dragon Balls. Piccolo eventually gave up his evil ways and joined the special forces, after learning to love by caring for Gohan as his own son in Goku's absence. Piccolo was killed by Nappa, protecting Gohan from an oncoming energy blast.