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Dr. Gero (ドクター・ゲロ) is a fictional character in the Japanese anime series Dragon Ball , voiced by Kōji Yada. His identity is that of a scientist for the Red Ribbon Army , who later modifies himself to become Android 20.. Dr. Gero (ドクター・ゲロ Dokutā Gero, lit. "Doctor Gero"), also known as Android 20 (人 じん 造 ぞう 人 にん 間 げん 20 号 ごう Jinzōningen Niju-Gō, lit. "Artificial Human No. 20") after converting himself into an Android, is a genius scientist who is the mastermind behind the Red Ribbon Androids, chief amongst them the bio-organic Cell. Dr. Gero is the main antagonist.

A comprehensive article about Dr. Gero, the genius scientist and villain from the Dragon Ball series, covering his backstory, role in the story, character analysis, themes, cultural impact, critical reception, and legacy.. Dr Gero is one of the smartest characters in Dragon Ball, possibly even smarter than Bulma and Dr Brief. Although we didn't see him until Dragon Ball Z, Dr Gero was the unseen hand behind the mechanical Red Ribbon army, which Kid Goku had such fun destroying. After being humiliated by Goku, Dr Gero made it his lifes ambition to create a machine capable of destroying the pesky Saiyan.