Raditz

Raditz is the biological brother of Goku and the son of Bardock. Raditz travels to Earth, from Planet Vegeta to find out why Goku hasn't finished his mission (Goku was sent to take over Earth). But upon arrival Raditz finds out that Goku is no longer evil but is good and that Goku has no knowledge of his ancestry, so Raditz attempts to persuade Goku into changing his ways but to no avail.

After Goku refuses, Raditz kidnaps Gohan and contains the young Halfbreed Saiyan in a Space Pod. However, Raditz' plan backfires when Goku forms a temporary alliance with the then evil Piccolo and together they attempt to defeat Raditz. The two fighters fought in vain against the Saiyan, until Gohan breaks from the Space Pod and headbutts Raditz, cracking his armour and dealing damage, allowing Goku to restrain Raditz while Piccolo performs his Special Beam Cannon. Piccolo's attack was just powerful enough to blast through Raditz' cracked armour and Goku alike.