Dr. Maki Gero, also known as Android 20, is a major recurring antagonist in the Dragon Ball franchise. He is the main antagonist of the Android Saga, the posthumous overarching antagonist of the Cell Saga, and one of the two secondary antagonists of the Super 17 Saga in Dragon Ball GT alongside Dr. Myuu. He is an evil genius scientist and a brilliant weapons designer behind the criminal organization known as the Red Ribbon Army. As an android, he can drain energy from people through a device on his hand. Being the one responsible for creating the androids and Cell, as well as Super 17. He is also the creator of Android 21 who was originally the mother of his son.