A strong, powerful Saiyan warrior, Raditz comes to Earth originally to look for Goku, his brother. Angry and intolerant, Raditz can't understand why it has taken so long for his little brother to destroy the helpless humans.
Ruthless like all the Saiyans, Raditz plays on Goku's emotions lying to his confused brother to avoid being destroyed. The minute he is saved however, he instantly turns on Goku. His last words reveal that two even more powerful Saiyan will be coming to Earth in one year in order to destroy it. And, unfortunately, his scouter (a technologically advanced eyepiece which gives location and power rating of opponents as well as acting as a communicator) transmits information about the Dragon Balls to the Saiyans.