Ep. 2: Raditz Reveals He Is Goku's Brother and the Secret of the Saiyan Warriors

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A stranger introduces himself as Raditz, claiming to be Goku's older brother. Goku has no memory of this due to childhood brain damage from a fall. Raditz explains they belong to an alien race called the Saiyans and are among the last four survivors. He demands Goku help exterminate Earth's population, taking Gohan hostage when Goku refuses. Piccolo appears and offers assistance in defeating Raditz. Goku accepts, and they pursue Raditz to his crashed space pod. During the confrontation, Raditz reveals he is not impressed by their strength and warns that the other two remaining Saiyans are even more powerful than he is.