Dr. Gero (ドクター・ゲロ, 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, are able to absorb the energy of others using small devices on their hands. The two eventually attack Goku and his friends. #19 manages to defeat Goku while he is being affected by his heart virus, but he is easily killed by Vegeta afterwards. Gero flees, attempting to release #17 and #18 as a last resort, though #17 quickly kills him. Gero appears once more in Dragon Ball GT
, planning to return to Earth along with Dr. Myu by creating another Android #17. They succeed, though Myu betrays Gero and has the newly formed Super 17 kill him once again. He is voiced by Koji Yada in Japan, Kent Williams in the Funimation dub, and Brian Dobson in the Ocean Group dub.