Saiyan Warriors
Radditz
Radditz travels to Earth in search of his younger brother Kakarot, who is now known as Goku. When they reunite, Radditz is disgusted at what his brother has become. He kidnaps his Goku's son and gives him an hour to wipe out half of Earth's population in exchange for Gohan's safety. Goku instead, with Piccolo's help, confronts Radditz in showdown, costing him his life. As his last words, Radditz warns Piccolo of stronger saiyans who will come and avenge him.
Saibamen
Little green creatures Nappa grows to battle with Earth's heroes. Their power was about equal to Radditz's.
Nappa
Nappa does most of the fighting when he and Vegeta land on Earth. It's hard to understand why this giant powerhouse would take orders from a little warrior like Vegeta.
Vegeta
The prince of the entire saiyan race. He seems to be the brains of the saiyan warriors. Despite his lack of size, he still has complete control of Nappa.
