ドクター・ゲロ, Android 20, Artificial Human #20
Dr. Gero Dokut Gero? made himself into a cyborg by implanting his brain into a robot body. He first appeared with Android 19 to kill Goku. After 19 was destroyed by Vegeta he fled out of fear and with the intention of activating Android 17 and 18. Once he activated them they quickly rebelled on their creator. 17 kicked his head off and crushed it. In Dragon Ball GT he helped Dr. Myu create Super 17 who later went on to kill both of them.