Android 17 was originally a human named Lapis, and the youngest out of him and his twin sister Lazuli (the eventual Android 1. The twins were notorious delinquents, who Dr. Gero would meet by chance while looking for fresh material for his experiments. He then kidnapped them and restructured them into Android 17 and Android 18. He is the first artificial human, out of him and his twin sister, designed by Dr. Gero to be created by fitting a human being with cybernetics. Technically, this actually makes him and his sister cyborgs. Since they are human-based, they can become stronger if they train. Though they do not need to eat, they do need to hydrate. Also, their cells deteriorate slowly, so they age slowly too.
Android 17 betrays and murders Android 20
Android 17 and his twin sister Android 18 are awakened by Android 20 (Dr. Gero), when he is pressed into a desperate situation by the Z Fighters, who have surpassed his expectations because of the intense training they endured after Gero collected their statistic data. Severely disloyal to Gero in contrast to the android models which precede himself and his sister, Android 17 turns rogue on the scientist, impaling and decapitating him. Android 17 and 18 then proceed to activate Android 16, and decide to challenge Goku not because they have been commanded to do so, but merely as a form of entertainment.
17 effortlessly choking Tien
When Vegeta (as a Super Saiyan) intercepts the trio, 17 and 18 implore 16 to step in and fight, interested to see him in action (their main purpose for activating him in the first place). However, Android 16 refuses to fight him, thus prompting Android 18 to volunteer. When Future Trunks, Krillin, Piccolo and Tien Shinhan arrive as Vegeta's reinforcement when Android 18 dominates Vegeta in the fight, Android 17 takes the opportunity to ask if Android 16 will join the fight, though as he initially assumed Android 16 once again opts not to. When 18 breaks Vegeta's arm during the battle, Future Trunks breaks Android 17's non-interference truce because he could not bear to see Vegeta injured. Android 17 intervenes and fights against Future Trunks, dealing one hard hit to his head, almost knocking him out. Android 17 also chokes Tien when the latter tries to punch him, and he does not let him go until Piccolo tries to save Tien. He then effortlessly defeats Piccolo, dealing a single blow that nearly tears through the latter. At the conclusion of the encounter, everyone is rendered incapacitated besides Krillin, who is spared so that Android 17 may see the others healed by Senzu Beans for another battle. This is one of many examples that set Android 17 and Android 18 apart from their future timeline counterparts, especially considering they are much stronger in the mainstream timeline than in Future Trunks' future.
Android 17 with 18 and 16
Later, Android 17, Android 18 and Android 16 arrive at Kame House, asking where Goku is. Piccolo (after fusing with Kami), challenges Android 17, hoping that he can defeat at least one of them and prevent Imperfect Cell from absorbing just one of his targets and achieving his perfect form, which would spell doom. Android 17 accepted Piccolo's challenge and contends to fighting Piccolo one-on-one, rather than fight with Android 18; this vastly increasing Piccolo's chance to win. Piccolo appears to have the upper hand in the battle; until Android 17 confesses that up until now he has not been taking their struggle seriously. Once both choose to go at full power, they find that they are an even match. Equal in both power and strength; Android 17 having an advantage because of his unlimited energy and speed, and Piccolo matching that with his regeneration and variety of energy attacks (Scatter Shot, Light Grenade, as well as other attacks). Android 17 almost gets injured by Piccolo's Hellzone Grenade attack, but he protects himself with an Android Barrier.
Android 17 prepares to fight Piccolo
"He keeps hoping he'll get lucky and hit me."
— Android 17, while fighting Piccolo
The fight is an apparent draw until Cell's arrival interrupts the match (ironically, Cell is able to detect Android 17 through the nearby presence of Piccolo, who had engaged Android 17 in an effort to impede Cell's progression to perfection). Piccolo assists Android 17 in avoiding Cell and Android 17 thanks him in return. While Piccolo tries to aid in the battle against Cell, he is tossed aside after Cell admits to have become stronger. Android 17 ends up horrified when he witnesses Cell brutally disposing of the Namekian. While Android 17 is struggling to defend himself, Android 16 steps in to fight Imperfect Cell and is able to hold Imperfect Cell off for some time, repeatedly surprising him with intense attacks such as his Hell's Flash. However, this sudden turning of tables creates an overconfidence in Android 17, who lingers to the scene of the battle, where the wounded but thriving Cell surprises and ultimately absorbs him, triggering his transformation into Semi-Perfect Cell.
Android 17 being absorbed by Imperfect Cell
All evidence of Android 17 is destroyed along with Cell's initial body, when Cell detonates himself as a last ditch effort to emerge victorious in the Cell Games (as his design allows him to regenerate so long as a single cell of him remains intact). However, 17's life is restored after the Z Fighters use the Dragon Balls to revive those who died as a result of Cell's campaign. A second wish made to Shenron by Krillin removes the self-destruct device within Android 17 and Android 18's bodies (Krillin originally intends to use the wish to turn Android 17 and his sister into Humans, but this proves beyond Shenron's power). Krillin did this because he thought 17 and 18 were meant to be a couple, until Android 18 angrily corrected him and revealed that 17 was actually her twin brother.
Life in obscurity
"So it's Goku, huh? I haven't heard that voice in a long time."
— "People of Earth Unite"
After the conflict with Cell, Android 17 becomes a park ranger in the wildlife preserve area of a gigantic royal nature park, where he is well paid. He is an outstanding guard who does not hold back against poachers. It is an ideal job for #17, as he loves to be on his own and is not big on cooperating with others; since he is so good at his job, he takes in a high salary. Android 17 also marries a zoologist; they have one child and two adopted children, and live happily in an isolated house inside the nature park. He went and met #18 and Krillin one time, but did not talk about what he had been up to, maybe because he considers such a wholesome lifestyle embarrassing.
Android 17's brief cameo during the Kid Buu Saga
Android 17 makes a brief appearance during the Kid Buu Saga, while Goku gathers energy for a Spirit Bomb in an effort to defeat Kid Buu. Apparently in a mountainous region, Android 17 is walking down a forest trail when he recognizes Goku's voice, then encounters two hunters passing through. Android 17 raises his rifle to trick the two into raising their hands, unaware that they are supplying Goku with their energy. To the hunters' confusion, the android smiles and proclaims "You beat me to it", before raising one of his own hands. The manga-equivalent of this scene does not feature the hunters; Android 17 merely raises his hands to pass on his energy while saying "So it's Goku, huh? I haven't heard that voice in a long time."
Prior to this scene, Kid Buu had previously destroyed the Earth with his Planet Burst technique, killing Android 17 again along with nearly everyone else. While fighting Kid Buu on the Sacred World of the Kais, Vegeta asks Dende to make a wish to Porunga for the Earth and the lives of all its good-willed inhabitants to be restored. The fact that Android 17 was not exempt from this wish, as confirmed by his appearance, is proof of Android 17's inherent goodness.
Android 17 confronts his sister during the Super 17 Saga
In Dragon Ball GT, Dr. Gero and fallen colleague Dr. Myuu brainwash Android 17 telepathically via Hell Fighter 17, a Machine Mutant version of himself created by the two scientists in Hell with the design of merging with him into the ultimate killing machine. Before merging, 17 asks Android 18 to join him, a gesture which she mindlessly obeys until a fatal attack on Krillin brings 18 back to reality, causing her to attack her brother. Seeing what she has done, he then targets Marron so he can gain full control of 18, but 18 defends her from 17's energy wave, leaving her in a critical condition. Android 17 locates his Hell Fighter counterpart and the two finally merge, becoming Super 17.
18 delivers a hard kick to 17's arm (a reference to 18's first fight with Vegeta)
The Z Fighters are shocked by the transformation until Vegeta attacks him, resulting in being knocked back by one punch. Majuub then tries in vain, followed by Goten and Trunks who attempt a combined attack, to no avail. Gohan then tries a Kamehameha, which does absolutely nothing to the super android (it was absorbed). Dr. Gero then tells Super 17 to demonstrate his true power, which leads him to strike down every Z Fighter, again using only a single hit. The Saiyans then assume their Super Saiyan forms, but Super 17 releases a Flash Bomber, weakening them enough to revert from Super Saiyan. Pan's ploy to have Gero bring 17 to a halt is ruined when Dr. Myuu reveals his programming placed him in full control of the super android, and so Super 17 kills Dr. Gero, for the second time. Piccolo and Dende create a gateway between Hell and Earth, allowing Goku to escape and confront Super 17, before any other Z Fighters can be killed. Goku is later joined by Android 18, whose appearance reminds 17 of both his own and Dr. Myuu's true nature, contributing to the ends of both Myuu (who was killed by 17's Electro Eclipse Bomb) and Super 17 himself.
Android 17 and Hell Fighter 17 fusing
As is revealed after the end of the fight, the real Android 17's psyche gives the Z Fighters a chance to destroy the super android, and both Android and Hell Fighter 17 in the process, by taking complete control of the body of Super 17 and powering up as Android 18 was launching shots of energy. This reveals to Goku that Super 17 cannot simultaneously move while absorbing energy, thus leaving him vulnerable to physical attacks. It is then that Goku uses the Super Dragon Fist technique to literally punch his way through Super 17, with the resulting hole rendering him unable to absorb the ensuing barrage of Kamehamehas, finally killing him.
According to Dragon Ball GT Perfect File 2, Goku's final request of Shenron at the conclusion of Dragon Ball GT to restore the lives of those who did not deserve to die between the Super 17 and Shadow Dragon Sagas revived Android 17.
There is some debate as to whether or not Android 17 and his sister are still alive 100 years after the events of Dragon Ball GT (particularly during the time of the 64th World Martial Arts Tournament and the events of the special A Hero's Legacy). While Dr. Gero states that the process of reconfiguring the siblings into cyborgs has made the two immortal, this might be contradicted by the special A Hero's Legacy, where it is narrated that Pan is the only character remaining from the generation of the original Z Fighters. However, this could be because the Androids may not be considered part of the Z Fighters.
Power and abilities
Android 17 is one of the most powerful fighters in the world, due to the cybernetic enhancements Dr. Gero gave him, including an unlimited supply of energy, allowing him to have endless stamina and not tire out in a fight. He was powerful enough to be an even match for Piccolo fused with Kami. Besides his power, Gero's android technology effectively makes 17 immune to aging.
Android 17's power level is 30,000,000 in Dragon Ball Z: The Anime Adventure Game.
Accel Dance – Android 17 and his twin Android 18 double team with a combo of punches and kicks, ending with their Power Falling Star technique. 17's alternate future self and alternate future sister use it to kill Future Gohan in Dragon Ball Z: The History of Trunks, and it is also Android 17's ultimate move in Dragon Ball Z: Budokai Tenkaichi 3.
Future Android 17 fires the Finger Beam technique
Android Barrier – A technique where energy is thrust out from the body in the form of a barrier with great force. The barrier can be used to both defend against oncoming projectiles and to expand and damage its surroundings, used in Dragon Ball Z and several video games.
Delta Combination – A rush attack used in Dragon Ball Z: Budokai Tenkaichi 2.
Endgame – A powerful physical technique. He uses this technique to kill Dr. Gero.
Energy Attack – The most basic form of energy wave used by androids.
Finger Beam – A barrage of narrow rays emitted from the index finger of its user, similar in execution to the Death Beam, which his alternate future self and his sister use in The History of Trunks special.
Finish Sign – A power up move that Android 17 used in the Budokai Tenkaichi series and the Raging Blast games.
Flight – The ability to fly without the use of ki.
Flip Cyclone – Android 17 flips backwards while dodging enemy attacks, and attacks the opponent with a forward kick. Used against Piccolo. Named in Dragon Ball Z: Battle of Z.
Android 17 charging the Electric Shot to attack Trunks
Full Power Energy Ball – An attack in which Android 17 fires two twin energy balls. His alternate future self uses this on Future Gohan in The History of Trunks. Android 17 uses this attack in Dragon Ball Z: Sagas, the Budokai Tenkaichi series, and the Raging Blast games.
Electric Shot – A double handed energy ball attack used against Trunks in Dragon Ball GT. Named in the Dragon Ball Z Collectible Card Game.
Kiai – Android 17 uses a special type of kiai that explodes on contact with the opponent, whereas a regular kiai would just blow the opponent away. He uses this attack instead of actual energy attacks during his fight with Piccolo.
Hypnosis Technique – While under this from Hell Fighter 17, Android 17 used it in an attempt to brainwash Android 18, but it failed due to Krillin's intervention. Android 17 killed Krillin with a Power Blitz right after.
Non-stop Violence – Android 17 fires Double Power Energy Ball, then does a 3 hit combo with Android 18. They both then fire an Energy Wave.
Now We're Playing for Keeps! – A physical attack used by Android 17 against Piccolo.
Photon Flash – A technique his alternate future self uses in The History of Trunks special. It is an energy wave emitted from the hand of its user. Photon Flash was named in Budokai Tenkaichi 3 and is one of Android 17's Blast 2 attacks. However, in Budokai Tenkaichi 1 and 2, it was named Full Power Energy Wave and is his Ultimate Blast.
Power Blitz – A strong energy wave fired from the palm of his hand. It can be launched as a single energy wave, concentrated into a ball of ki or volleyed in a rapid barrage of energy waves called Accel Shot. This is the signature finishing move for androids 18 and 17 in the Budokai video game series.
Accel Shot – Android 17's version of the Infinity Bullet. It is one of his ultimate attacks in Dragon Ball Z: Burst Limit.
Power Falling Star – The technique used to finish the Accel Dance. Named in the Budokai series. It is called Full Power Energy Blast Volley in the first Dragon Ball Z: Budokai Tenkaichi.
Portal Opening – A technique used with Hell Fighter 17 in order to open a portal between Earth and Hell.
Hell Spiral – A team attack used by Android 17, Android 18, and Android 16 in the Nintendo DS game Dragon Ball Z: Supersonic Warriors 2.
Buster Swing – Android 17's grapple toss in the Budokai series.
Power Strike – Android 17 kicks the opponent up in the air, and then he kicks and punches them down again. Used in the Budokai series.
Violence Hold – One of 17's techniques in Super Dragon Ball Z. Also used by 18.
Savage Combo – A powerful kick combo used in Super Dragon Ball Z. Also used by 18.
Avenging Fork – A spin kick technique used in Super Dragon Ball Z.
Jade was a bit curious how she died but decided not to press on him any further. "I see..." This whole conversation made a flashback to the part where both her mother and father were very abusive towards her when she was little.
"A hunter, sounds exciting." A sly grin formed Jade's crimson lips and with a swift of her hand she took the beer out of his hand and took a sip of the beer. Taking a few gulps she handed him back the beer."Yummy."