Android 19 will be referred to as "#19" (Number Nineteen), as in the show. #19 is one of the first androids seen in Dragon Ball Z. The Energy Absorbing Androids have "energy inlets" on the palm of their hands, and are able to drain their victim's energy through them. He plays a small role at the start of the Cell Saga as Dr Gero/Android 20's side-kick. He is not particularly strong, but manages to best Goku in a fight, due to the heart virus that Goku had contracted at the time. #19 then almost kills Goku by draining him of his energy, but is interrupted by Vegeta, who wants to be the one to kill Goku.
Vegeta then reveals that he is now a Super Saiyan and although Goku was one too, he was not at full strength due to the heart virus. Their fight then commences, and Vegeta clearly has the upper hand, before #19 manages to latch his hands on to Vegeta's wrists. Vegeta plays it cool, letting the android drain some of his energy, before he pulls the android's hands clean off. #19 is then terrified, and scrambles away fearing for his life. Vegeta then finishes #19 off with his signature Big Bang Attack. When coming back from the future, Trunks finds 19's head, and realizes that these are not the androids from his timeline.