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Dr. Gero (Android 20)

人造人間20号 Dr. Gero
Jinzōningen Nijugō

Anime name Android #20
Manga name Android #20
Alternate names Doctor Gero
Jinzōningen #20
Cyborg 20
Artificial Human #20
Artificial Human No. 20
Cyborg 20
Dr. Maki Gero (Latin American Dub)
Dottor Gelo (Italian Dub)
Dr. Żiro (Polish Dub)
Debut Manga: "The Gathering of the Warriors"
Anime: "The Androids Appear"
Appears in [1]


Race Human / Android
Gender Male
Date of death May 10th, Age 767
Address Dr. Gero's Lab
Occupation Scientist
Allegiance Red Ribbon Army (??? - Age 750)
"I cleared the area of innocents, in accordance with your wishes. Do you disagree with my methods?"
— "A Handy Trick"

Dr. Gero (ドクター・ゲロ, Dokutā Gero), also known as Android 20 (人造人間20号, Jinzōningen Nijugō), is a very intelligent scientist who is the mastermind behind the Red Ribbon Androids.


[[[|hide]]]*1 Overview



After the Red Ribbon Army's downfall and collapse at the hands of Goku, Gero retreats to his mountain laboratory to plot his revenge with his Artificial Humans series. Not until he reaches Android 19, does he create an obedient, bloodthirsty servant. Gero then has #19 transplant his brain into an android body, thus turning himself into Android 20 and preventing him from dying of old age. After his second defeat at the hands of the Z Fighters, Gero retreats to his lab to activate Androids 17 and 18, who rebel, with Android 17 killing the doctor. Though Gero dies, he leaves behind Android 13, Android 14, Android 15, Android 16, as well as his ultimate creation, Cell.

Personality and AppearanceEditEdit

Dr. Gero is very cold-hearted, willing to stop at nothing to achieve his goals, even kidnapping other people to use in his experiments. He also holds a strong hatred for Goku after the latter defeats the entire Red Ribbon Army. Dr. Gero's appearance consists of slightly tanned skin, blue eyes, a large bushy white mustache, and long hair. He also has a Red Ribbon Army logo located on the hat that hides his visible brain after he turns himself into an android.


Red Ribbon scientistEditEdit

Dr. Gero is the head scientist of the Red Ribbon Army and creates the first androids in the service of the Red Ribbon Army. Another scientist, Dr. Flappe is named as Android 8's creator. Daizenshuu 7 addresses this inconsistency by stating that Dr. Flappe and Dr. Gero were colleagues in charge of the Red Ribbon Army's Android Development Program.

Quest for VengeanceEditEdit

After the Red Ribbon Army is defeated by Goku, Dr. Gero goes into hiding in his laboratory located in a mountain area north of North City. In this lab, he strives to create the ultimate fighting machine. Using an extremely intelligent tracking device disguised as a ladybug, he studies Goku and the Z Fighters for years, observing the fights Goku has with Tien Shinhan, King Piccolo, Piccolo, and the Saiyans Raditz, Nappa and Vegeta.

Dr. Gero ceases the study of Goku's power when the Saiyan leaves for Planet Namek, believing he had already compiled enough information; so he simply adjusts the androids' power levels to accommodate for Goku's expected power increase, not accounting for the power level of Goku's Super Saiyan form. Believing he had created the ultimate fighting machines, he finalizes his plans and constructed a series of Androids. While Dr. Gero is looking for fresh material for his experiments, he meets two notorious delinquents by chance, two siblings, a boy and a girl. He then kidnaps them and restructures them into Android 17 and Android 18.[1] According to Android 18, Dr. Gero destroyed all the other androids up to 15.

While constructing the Androids, Dr. Gero discovers a way to fuse together the cells from the strongest warriors to walk the Earth (Goku, Piccolo, Vegeta, Frieza, and King Cold), and tries to create a supreme fighting entity. After realizing that his project would take too long to complete, he decides to turn attention to other matters and leave his supercomputer from his lab to complete the ultimate being, who he names Cell.[2]

To become immortal, Dr. Gero turns himself into an android, Android 20.[3][4] The only human part of him as an android is his brain, which was transplanted into his android body by Android 19. Dr. Gero has his brain transferred into an energy-absorbing model Android rather than an infinite-powered model, which would have allowed him far greater power reserves. Android 18 hints that it may have been because he thinks that an energy-absorbing model android is easier to use as a host.

Android unleashingEditEdit

Two years after Namek's destruction, after easily slaughtering Frieza, his soldiers and his father, Future Trunks informs the Z Fighters that two extremely powerful Androids created by Gero will appear in three years. Three years later, on May 12th at 10:00 am, on an island nine miles south-west of South City, two Androids appear: Android 19 and Android 20. Together, they start a killing spree and do not show any mercy or regret; during one point, Gero grabs a man from his car and crushes his skull like a grape, never changing his stoic expression. The Z Fighters struggle to find them, due to the androids having no ki, but Yamcha is the first to find them, attracted to the scene by the scream of a woman.

Before Yamcha can act, Android 20 demonstrates a deadly power: Dr. Gero's latest design for Androids, an energy absorbing function. Using a small red jewel embedded in his hand, he grabs Yamcha by the jaw, punches a hole through his chest, and saps his life-force. The Z Fighters detect Yamcha's fast dropping energy, and then find the Androids. After an explanation of their origins to Goku, Tien Shinhan and Piccolo, the fight is about to begin. However, after Goku suggests that they move to another location since there are too many people around, Gero takes it as meaning that he doesn't want anyone to get in the way and single-handedly destroys half the city and its populace with his Bionic Punisher technique. Angrily, Goku leads him and Android 19 out of the city, to avoid killing more people in the fight. In some unknown island, Android 20 begins to explain to Goku why Gero wants to have his revenge on him for destroying the Red Ribbon Army. After the explanation, he orders Android 19 to fight Goku. Goku, at the start, does well in the fight, but due to the Saiyan's Heart Virus that manifests at that exact moment, Android 19 wins the fight. After Vegeta arrives on the battlefield and turns into a Super Saiyan, destroying Android 19, Android 20 runs away.

During the ensuing search, Android 20 attacks Piccolo from behind to absorb his energy, only to be attacked by Gohan. He tries to fight Piccolo head-on, but Piccolo is superior by far as a result of the three years of intense training with Goku (and also the fusion with Nail). Piccolo mercilessly severs the android's arm and prepares to destroy him when Gero retreats once again into the rocky mountains. Android 20 decides to retreat into his lab, in order to activate Android 17 and Android 18. Having recognized him as Dr. Gero, Bulma notifies the Z Warriors about the approximate area of his laboratory and they depart for the north.

While approaching his lab, Android 20 ambushes Krillin, but spares him in his hurry to activate his Androids. Krillin follows him to his lab and summons the Z Warriors there. Android 20 enters his lab and activates Android 17 and Android 18, having a controller that can deactivate in case they rebel again. The androids fool him into believing they are obedient, until they snatch the control from him. After crushing it, Android 17 brutally murders Gero by decapitating him, and then stepping on Gero's head. His remains are later destroyed along with what seems to be the rest of his laboratory at the hands of Future Trunks when he fires the Buster Cannon with the intention of destroying Android 17 and Android 18.


By means unknown, Dr. Gero is permitted by King Yemma to keep his android body while entering Hell. Along with Super Perfect Cell, Frieza, King Cold and the Ginyu Force, Dr. Gero watches the final battle between Goku and Kid Buu, being one of the very few people cheering for Kid Buu.

Escape from HellEditEdit

Dr. Gero is first seen in Dragon Ball GT in Hell, greeting Dr. Myuu after Myuu is destroyed by Baby. There, the two scientists work on a plan to create the ultimate android which could destroy Goku. They came up with a plan to combine both of their technologies and achieve the perfect Android by fusing Hell Fighter 17 and Android 17 to create Super 17. Then, they created a dimensional hole to get both androids in the same place, Earth. On Earth, while Super 17 is engaged in combat with Vegeta, Trunks, Goten, and Majuub, Pan sneakily grabs Dr. Gero from behind to make him deactivate Super 17. During the confusion, he is betrayed by Dr. Myuu who commands Super 17 to kill him, leading to him being killed by 17 a second time. Dr. Gero is later sent back to Hell.

in a what if saga dr gero retruns and battles videl goten trunks one at a time dr gero defeated videl by puting his hand over her motuh and absorb her energy dr gero kills videl by jaming his hand throw her stomach next dr gero runs way form the battle and finds goten and battles him and gero beats him up for bit then goten truns ssj hit gero in in face however goten fires kamehemea at gero and gero absorbs it then gero punchs goten in the stomach and defeated goten and absorbs his energy but puting his hand over goten mouth then gero kills goten the some way he killed videl then dr gero battles trunks hit him in stomach befor grabing trunks by the mouth and defeating trunks and absorbing him then gero kill trunks by jaming his hand throw trunks stomach later gero battles with gohan and stell gohan energy and then gero defeated gohan and kills him by jameing his hand throw gohan stomach dr gero is later defeated by vegeta and 19 is killed by goku who had killed krillin later gero 19 return agian in gt and dr gero kill pan after absobring her engey and 19 dr gero battle goku and they start to absorb his energy but goku kick way free kills 19 however gero grabs goku again fianly stell all if goku egeny and kills him by jamming his hand throw goku stomach later gero battles with audlt gotenks beats him up put his hand over adult gotenks motnh stell his engey then kills him by jamming his hand throw his stomach he the attacks goku mother gine put has hand over her mouth to absorb her power befor killing her by jameing has hand thorw her stomach dr get go after tarble cabe beat note forte vioal eart bakshu nico nimu goku jr vegeta jr next defeats all them and absorbs all there power befor killing them

Videl Death by the hands of C-20 and C-19 2

dr gero absorbs videl energy


"Curse you.....I"
— Dr. Gero after 17's attack


The exact strength of Gero in his Android 20 form is never elaborated on, given his short time menacing the Z Fighters. Considering Android 20 was able to take down Yamcha (who had previously been seen defeating Recoome) and Krillin, it is obvious that his power is far above the Ginyu Force's. However, if 19's struggles against the Super Saiyans are any indication, then Android 20 is nowhere near the power of a Super Saiyan, in spite of their confidence when witnessing Goku transform. Android 20 also briefly faces off against Piccolo and appears to be completely outmatched, with Piccolo's power increased since the Frieza Saga after the massive amounts of training that took place in preparation for the Androids.

Special abilitiesEditEdit

Aside from his incredible intelligence (one of the best in the world, impressing even Capsule Corporation president Dr. Brief), Dr. Gero has gained combat abilities due to placing his own brain into an energy-absorbing model android.

  • Built in Scouter – Built into his own Android body is a scouter that allows 20 to detect energy levels.
  • Flight – Like most characters in the series, Gero can fly in the air. However, like most Androids, he does not possess ki, so he flies by the means of a certain machine called Hikou in his body.
  • Energy Absorption – Android 20 has special pads on his palms that allows him to absorb life-energy from his victims by grabbing them.
  • Energy Attack – The most basic form of energy wave used by androids.
  • Eye Laser – A synthetic form of eye laser strong enough to pierce through someone. Android 20 uses this attack in the series, as well as in Dragon Ball Z: Super Butōden, the Supersonic Warriors series, and other video games.
    • Bionic Punisher – A powerful beam shot from both the eyes which is strong enough to devastate an entire city.
  • Photon Wave – The Full Power Energy Wave he used to flee from the Z Fighters in order to activate 18 and 17. From his energy-absorbing pads, 20 releases a massive wave of explosive energy that can level an entire valley.
  • Photon Blast – The Full Power Energy Ball version of the Photon Wave, Android 20 shoots a pink energy sphere out of his hands. Named in the Supersonic Warriors series. It is called Energy Discharge Blast in Super Butōden.
  • Pesky Fly – The rush attack that Android 20 used against Krillin.
  • Precise Cannon – A Continuous Energy Bullets technique used in the Budokai series.
  • Rolling Crush – Android 20 kicks the opponent up and grabs them in mid-air to perform a spinning piledriver.
  • Power Break – Android 20 kicks the opponent up in the air, then he punches and kicks them down again, and finally 20 kicks his opponent in the back when he is down. Used in the Budokai series.
  • Finish Sign – A power up move that Dr. Gero used in Dragon Ball: Raging Blast.
  • False Courage – A power up move that Dr. Gero used in Dragon Ball: Raging Blast.
  • Twin Drain – A team attack performed by Dr. Gero and Semi-Perfect Cell in Dragon Ball Z: Supersonic Warriors 2.

Video game appearancesEditEdit

In Dragon Ball Z: Supersonic Warriors, Dr. Gero has a what-if saga creating androids to try and destroy Goku. Every time he tries, Goku and his friends defeat him and foil his plans forcing Gero to return to his lab, defeated. In Dragon Ball Z: Budokai 2, the World Tournament Announcer refers to him as Dr. Gero, even though he is titled "Android #20" in this mode.

Dr. Gero appears in the following video games:

Voice actorsEditEdit

  • Japanese version: Kōji Yada
  • Ocean Group Dub: Brian Dobson
  • Blue Water Dub: Jonathan Love (DBGT)
  • FUNimation Dub: Kent Williams
  • German Dub: Gerhard Paul
  • Italian Dub: Oliviero Corbetta
  • Portuguese Dub: António Semedo
  • Brazilian Dub: Aldo César (DBZ), Luiz Carlos de Moraes (DBGT), José Carlos Guerra (DBZKai)
  • Polish Dub: Wiktor Zborowski
  • Spanish dubs:
    • Latin American: Jose Luis Castañeda (DBZ), Guillermo Coria (DBZKai)


  • Contrary to popular belief, the destruction of the Red Ribbon Army is not the primary reason for Dr. Gero's desire to create androids and cyborgs, as he reveals in GT that he always dreamed of replacing the entire human race with artificial beings even before Goku defeated the Red Ribbon Army. This is seemingly supported by Android 8 being around during the existence of the Red Ribbon Army.
  • Despite being part of the Red Ribbon Army, which plays a major role in Dragon Ball, Dr. Gero was never even mentioned until Future Trunks mentions him during the Trunks Saga of Dragon Ball Z. Strangely in the FUNimation dub, when Trunks explains the androids to Goku, he talks as though Goku confronted Gero and spared his life, telling him he should have never let Gero go. Goku seems to confirm this, despite there has never been a meeting between the two. This dialogue is altered in Dragon Ball Kai with Goku instead expressing surprise that someone in the Red Ribbon Army managed to escape its destruction. This is slightly inaccurate, as several Red Ribbon characters and many soldiers seemed to have survived its destruction.
    • In the same episode dub, Trunks also implies that Dr. Gero was the leader of the Red Ribbon Army, despite Commander Red being the leader.
  • In one flashback sequence from the episode "Double Trouble for Goku", Master Roshi refers to Dr. Gero as the "current leader" of the Red Ribbon Army. This is technically true because, his later creations aside, he is the highest ranking actual member left.
    • In the FUNimation Dub of the same episode, Master Roshi also claims that Dr. Gero was the leader of the Red Ribbon Army during the time Goku destroyed it, and it is also implied that all of the appearances of Commander Red in the flashbacks were actually of Dr. Gero.
  • Android 20 loses his right hand during his battle with Piccolo, but in the scene when 18 walks over to 16's pod, he grabs her with his right hand.
  • In both Super Android 13! and the brief flashback from Dragon Ball GT, the dialog in which 17 kills him is different than that of the Dragon Ball Z anime.
  • In Dragon Ball Z, Dr. Gero is seen in Hell without his hat when he watches Goku's fight against Kid Buu. Later, in Dragon Ball GT, Dr. Gero is seen with his hat back on.
  • In the FUNimation Dub, the G in his name is pronounced like a soft J, and the "er" is pronounced as such. While in the Ocean dub, they start pronouncing it differently, with the G sounding like a hard J, and the "ero" sounding more like "arrow," while in the original Japanese and translations that follow this pronunciation, the G in his name is a normal G, as in "grip," making his name "Geh-roh," as in grapple.

Dr. GeroEdit


dr gero make retrun doring hells 3rd invasion if earth where fights gt kid goku and doing the fight goku underestimats dr gero ends up getting punched in the stomach by him goku lands on his knees holding his stomach wandering how gero become stronger then he is his base form goku turn super saiyan gets reday to fight gero but

Before goku can act, Android 20 demonstrates how much faster he is then goku: dr gero, grabs goku by the month,saps his life-force form him and .pan detect goku's fast dropping energy,as goku grows weeker he retuned normal gero tell goku it to late brat your far to week to sotp me now thanks for egney boy he say puncheing a hole through goku stomach,after sucking him dry if ki pan show up see the hole in goku stomach in raged she turn ssj battle gero but gero elbow pan in her stomach then

grabs pan by the month saps her life-force form her as pan grows weeker and retuned to normal gero tell her you made some worng move goku did pan you underestimated me young girl now your paying for it this is the red rbion army revgne fsit take goku egney killed him now am takring yours and I will then kill you brat he say sucking pan dry if her ki puncheing a hole through pan stomach

gero drops pan next to goku say with egney if asorbed form pan and goku now can sotp me now gero takes dead bodys if goku pan to his lab turneds them int o andorids android g android p then dr gero tarver back in time with android p and g fights teen gohan the 3 if them over power him with hits to gohan stomach face then drgero grabs gohan by the month saps his life-force form him and .pan detect goku's fast dropping energy,as goku grows weeker he retuned normal gero tell gohan boy your going to become in android once I kill you brat he say puncheing a hole through gohan stomach after sucking him dry if his egney

then later android g2 gohan is made