Replying...
Intro. Here we are in Dragon Ball Z more specifically we are in the Android saga as it says in the title I will give them a small summary of what happened in the Namek saga in summary Frieza Asesino to Krilin in front of Goku which made him angry too much transforming into super saiyayin (phase 1) managing He learned the teleTranspotacion what he does scheme allows him to be someone to feel his ki and also if someone touches Goku and he uses the teleTranspotacion the person who touched him will also be teleported, now that they have some context we go with what we come here as in the original Saga Goku has a problem in the heart was going to lose against the Android 19 but Vegeta (another Saiyayin) He saved, transformed into Super Saiyayin and Mato to 19 after that Dr. Maki Gerro withdrew from the place taking his laboratory waking up number 18 and number 17 but he was killed

Dragon ball Z: saga of the androids

@Kenjaku