Dragon Ball Z - episode 3 - 09 May, 1989

Raditz has kidnapped Gohan! And unless Goku agrees to forsake his friends and the people of Earth by joining the sinister Saiyan, he may never see his son again! All hope is not lost, however, as a second uninvited guest arrives on the island - and Goku forges an unlikely alliance! (Source: dbzepisode.org)