Nappa is Vegeta's traveling partner. As the First Commander of the Saiyan army he is to be considered a powerfull foe. To others than Goku that is. As Vegeta and he try to destroy all but the Namek Picollo, Goku comes back from his Kao-Ken lessons and beats him easily. Vegeta then ofcourse vaporizes Nappa as he made a shame of his Saiyan race. Nappa is quite tempered and ridiculously stupid. Makes me wonder how Vegeta put up with him. He used to have hair ya know?