1x2 - Dragon Ball Z: Dragon Box

Goku visits the Kame House, where the Turtle Hermit and Kuririn have been living, for the first time in five years. As all of them are enjoying their reunion, a warrior lands before them, and addresses Goku as "Kakarrot." The man, who has a tail, just as Goku did as a child, identifies himself as "Raditz," and declares that he is a Saiyan, the mightiest race of warriors in the universe, as well as Goku's older brother. He then orders Goku to join forces with him.