Doctor Gero (Dokutā Gero) is the former chief scientist of the Red Ribbon Army. After the destruction of the organization, he begins using his development of androids to aid in destroying Goku for revenge. While creating a series of androids, he eventually implants his own brain into an exact replica of his body, becoming Android #20. Both he and Android #19, a round, pale android and the most loyal of Gero's creations, are able to absorb the energy of others using small devices on their hands. The two eventually attack Goku and his friends. #19, successfully draining Goku of his energy while Goku is affected by his heart virus, is killed by Vegeta afterwards. Doctor Gero flees, attempting to release #17 and #18 as a last resort, though #17 quickly kills him. Doctor Gero appears once more in Dragon Ball GT, planning to return to Earth along with Doctor Myu by creating another Android #17. They succeed, though Doctor Myu betrays Doctor Gero and has the newly formed Super #17 kill him once again.