DBZK Episode 18
From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Goku, Krillin, and Gohan are in the hospital recovering from the battle with Vegeta. Their friends and family come visit. Krillin remarks to Goku that he looks like a mummy who forgot to wrap his face. Bulma bursts in and when the television is turned on, they see a report about Nappa's space pod. Bulma, thinking she's pressed the button that will have it fly towards them, instead self-destructs the pod. Before everyone gives up hope, Mr. Popo arrives, and tells them that he knows of another spaceship. It's the Namekian ship that Kami used to come to Earth when he was a boy. Bulma reluctantly agrees to inspect it up in Yunzabit Heights with him, an abandoned chain of islands where Kami spent his childhood until his mid-thirties. They realize the craft is voice-activated in the native Namekian language, with the word 'Piccolo' as the entrance code. Bulma converts the language to English a few weeks later. Gohan and Krillin decide to accompany her on her journey to Planet Namek in search for the Dragon Balls.