Fan Casting Dr. Gero/Android 20 in Dragon Ball

The cold hearted mastermind behind the Androids. Dr. Gero originally worked for the Red Ribbon Army before Goku eliminated them. This prompts a vengeful Gero to create the powerful Androids, 17, 18 and the Bio-Android Cell to destroy him. Android’s 17 and 18 are responsible for destroying Future Trunk’s time. Trunks then goes back in time to change this outcome. Trunks’ interference with the timeline has its consequences, shown when Gero has revealed to have turned himself into an Android that can steal energy. Eventually, the present timeline Android 17 rebels and kills Dr. Gero.