Dragon Ball Z - episode 65 - 30 Oct, 1990

Since Krillin and Vegeta can't fight anymore, Gohan is the only one left to fight. Captain Ginyu, leader of the Force, locates all seven Dragon Balls, and brings them to Frieza. Frieza tries to make his wish, but realizes he doesn't know what to do. He figures there must be a password. Meanwhile, Gohan gives it everything he has against Recoome, but the giant warrior is too strong. Just as he is about to finish off Gohan, everyone senses a gigantic power arriving on the planet. Krillin, Gohan, and Vegeta realize it is Goku. (Source: Wikipedia)