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I've finally found an interesting subject. I can't let this opportunity slip under my nose. My desire to know... is throbbing!
~ Doctor

Doctor is a major villain from the manga Black Cat and its anime adaptation. He is a high-ranking Apostle of the Star and a talented scientist in charge of their secret projects on nanomachines, to make Creed Diskenth immortal and create an army of super-soldiers. While Shiki is the second-in-command of the Apostles, it eventually appears that Doctor is the true right-hand-man, and the closest thing to a friend for Creed. Doctor's real name, mentioned only in the anime adaptation is Kyosuke Kanzaki.

He was voiced by Yuu Mizushima in the Japanese version, and by J. Michael Tatum in the English version.


It's often said: A person can't always make other do what they want to do. But with a little manipulation of the brain's secretion function, you can do just that.
~ Doctor (about people he brainwashed)

Doctor is calm and collected. He speaks courteously and is frank, even when telling his foes what fate awaits them. However, this is but the tip of the iceberg. In truth, Doctor is a mad scientist through and through.

He is obsessed by science and fixated to understand how everything works; an obsession driven by sheer psychosis. He conducts experiments without the slightest regard for morality, being willing to dissect a child without second thoughts. He only regards human beings as guinea-pigs and relishes in making people "evolve".

He shares Creed's desire to make immortality possible, and even though he seems to lack a desire of it for himself, he wants to achieve it as a scientific breakthrough. He also appears as power-hungry, given that he follows Creed's desire for a global revolution and is the only Apostle who knows of Creed's real goal without being disturbed.

Doctor is a highly intelligent and calculating man, who remains in the shadows and observes the situation before making his move.

Doctor also appears as greedy and cowardly, as he asks for lots of money for his services (outside of his Apostle's duty) and he never fights by himself. Furthermore, he is a remorseless sadist who likes to play foul mind games, such as forcing people to fight their comrades or their loved ones.

His polite manners merely express his complete disregard for people; for he considers feelings and emotions as useless hindrances for a full understanding of the human psyche. When asked why he does such horrible things, he casually answers "Because it's fun". All this makes him far and away the vilest, most repulsive of the Apostles of the Star, even worse than Creed himself.

Powers and Abilities

An excellent scientist in his own right, Doctor specializes in genetics and technology, and especially nanomachines, which leads him to undertake the Apostles of the Star's scientific experiments. He has a wide knowledge of the living anatomy and the genetic history of animal species, which comes in handy in both his scientific works and his powers of Tao.

Doctor's power of Tao first appears as the ability to heal wounds, but this is in fact an extra skill, likely depending on his knowledge of medicine coupled with ki manipulation. He knows how to send his ki into someone else's body to manipulate their cell activity. Judging by his own words, he heals wounds by reactivating and manipulating dead cells, but he needs the wound to be clean and the cells to be undamaged.

This does not stop to healing, as he able to fully paralyze at least two people at the same time, without regard for their fighting skills. This part of Doctor's powers is never fully explained and its true extent remains unknown. Yet he does not seem able to paralyze anyone at will, given that he never uses it when fighting. One might think that he needs either to gather a great deal of ki or to set a trap.

Given the extent of his ki mastery, Doctor is very likely trained enough to be able to use it to locate people and to use his ki to increase his physical prowess, though he is never seen using it.

Doctor is not a fighter but he is still one of the most powerful and dangerous Apostles of the Star. His power of Tao is called "Warp World". It makes him able to create a pocket dimension in which he controls absolutely everything, and where everything he imagines comes into existence. He can bend the laws of physic, make pictures talk, make dolls move like living beings, make things appear out of nowhere, and even increase the size of a room.

Inside this dimension, Doctor can separate people and separate the Warp World itself into totally different spaces. Furthermore, he has unexplained access to people's minds and he can brings things and people he finds in their thoughts or memories into existence. Doctor can bring anything and anyone into the Warp World but even there, he cannot transform or manipulate them in any way.

Doctor is but a regular human outside the Warp World, but inside it he becomes virtually invincible, no matter how powerful his foe may be. In battle, he enters the Warp World and awaits his foes inside. He can make the entry to the Warp World (which looks like a door to an operation room) appear wherever he wants to and he makes it appear near his foes, so that they would enter without knowing it and get trapped.

He usually remains in a safe space where he can watch his foes squirm and struggle in vain. He sends them in a place they cannot escape to fight something they cannot defeat. Either into maddening, ever-changing mazes, or against enemies impervious to all harm, which he can transform at will to take them off-guard.

Role in the Manga

Doctor is one of the first Apostles of the Star, who comes from the Jipang archipelago: the Black Cat counterpart of Japan. He first appears after the battle between Creed and his former partner, the main hero Train Heartnet, a legendary gunfighter feared worldwide as the Black Cat.

Train willingly let Creed sever his right hand to locate his invisible blade, before shooting him in the stomach with an exploding bullet. But his constantly bleeding wound puts his life at risk, so Creed orders Doctor to find and heal Train. The scientist greets Train amiably and reattaches his hand to his arm with his healing technique, telling him that if it were not for Creed's request, he would have asked an enormous sum of money.

Later, Doctor fails to heal Creed with his technique alone, the anarchist being too severely wounded, so he puts him into an artificial coma after injecting him healing nanomachines.

Doctor is next seen discussing with Creed on Clarken Island, as Creed is now fully healed and waiting for all the Apostles to gather and attack the World Conference. Doctor does not take part in the slaughter but he follows Creed to the meeting room and witnesses the murder of the country leaders, affiliated to the secret society Chronos.

Doctor later calls back all the Apostles. When Creed kills Durham and Charden objects, Doctor counters that he finds the punishment appropriate, given that Durham acted on his own without permission and failed to recognize his limits.

the Lucifer Werewolf

A few weeks later, Creed asks Doctor to go and fetch the thief for hire Rinslet Walker, who was investigating on the Apostles of the Star on Chronos' behalf. Doctor arrives right on time to save Rinslet from Kyoko, who mistook her for a bounty-hunter. He brings her to Creed's castle, while warning her that she will be the Apostles' prisoner and might not exit the castle alive.

Doctor injects one of the bounty-hunters captured by the Apostles with "Lucifer" nanomachines, turning him into a brainwashed, feral and self-healing werewolf. Creed later uses Rinslet as a hostage to force the Chrono Number V Naizer Blackheimer, who invaded the castle alongside Number VII Jenos Hazard and Number XI Beluga J. Heard, to fight the werewolf one-on-one.

After Naizer defeats the werewolf and Train arrives to rescue Rinslet, Doctor activates the self-destruction mechanism to blow up the castle and orders every Apostle to leave.

After the explosion of the castle, Doctor is seen is the Apostles' airplane, confident that Creed, who remained inside has survived. He later sets into motion the Apostles’ Plan B as instructed.

He later sets into motion the Apostles' Plan B as instructed. Doctor and Shiki visit Dr Tearyu Lunatic, the world's greatest nanotechnologist and ask for her cooperation to create nanomachines that could make Creed immortal. Doctor gives Tearyu a sample of "Lucifer" nanomachines, hoping to perk her interest, and tells her that the Apostle will come back to know her final answer within a few days.

When the Apostles do come back, Eathes uses his power of Tao to copy Tearyu and steal all her knowledge about nanomachines. A knowledge that Doctor would then use to create the "God Bless" nanomachines to turn Creed into an immortal "god".

Fudo and Mundock turned into berserkers

During the second part of the final battle on Clarken Island, Creed orders Doctor, Echidna and Eathes to fight Train Heartnet and his fellow bounty-hunters without holding back. Doctor and Echidna are seen in the monitoring room of the manor, watching Train and Eve fight two bounty-hunters that Doctor captured by paralyzing them, before injecting them with "Berserker" nanomachines that he created.

Doctor revels in this gruesome scene, and taunts the bounty-hunters during the whole fight. When Eve manages to destroy the "Berserker" thanks to her own nanomachines, Doctor resolves to capture and dissect her, to understand how her body functions. Doctor later drags Train and Eve into the Warp World and sends them into different spaces.

Train in the Warp World

Doctor traps Train into a misty, deserted town, where he has to fight invincible doppelgangers of his late friend Saya Minatsuki and of Kyoko, so that he would die by the hand of people he holds dear.

Meanwhile, he lures Eve into a seemingly normal house, which he makes bigger and animates the toys and furniture to toy with her mind, before meeting her in person.

Eve recognizes his voice and angrily attacks him, to teach him the pain he likes inflicting. However, it appears that she merely knocked out a doppelganger, while the real Doctor remained out of reach.

Doctor then reaches into Eve's memory and creates a doppelganger of Eve herself, back when she was used as a living weapon by the weapon dealer Torneo Rudman. As Eve is gaining the upper-hand, Doctor turns her doppelganger into one of Sven (Train's partner and Eve's caretaker), taking advantage of her hesitation to attack her father figure to knock her out.

Doctor brings Eve into his operation room, and ties her to an operation table that shocks her when she uses her nanomachines power. Doctor first analyses Eve's blood on a microscope, before proceeding to dissect her. Only a miracle can save both Eve and Train and a miracle does happen.

Doctor in his Warp World

In dimension where memories can be materialized, Train's strong memories of Saya allow her to manifest in the Warp World as a ghost, and she saves Train from Doctor's trap.

Saya brings Train into the room of operation, in which no one can normally enter without Doctor's consent. Train kicks the mad scientist in the face and sets Eve free, but Doctor retaliates by creating countless huge scalpels from every wall, preparing to hurl them at the duo.

Fortunately, even in his Warp World the demented scientist is no match for Eve in a direct confrontation and she beats him up, to teach him real fights and true pain. Right after, Train finishes him off with a punch on the face that breaks his glasses. With Doctor knocked out, the Warp World vanishes and Train and Eve reunite with Sven.

With Doctor knocked out, the Warp World vanishes and Train and Eve reunite with Sven. After Doctor's defeat, Echidna is forced to release the first results of his experiments to create superhuman soldiers, the Phantom Star Brigade.

When the trio reaches the third floor of the mansion and find Doctor lying unconscious, Eve sticks her tongue at him, still resenting his actions. After Creed's defeat, Doctor is seen living in the streets as a beggar, alone and helpless, with Leon and Eathes walking next to him without paying him any attention. (They might not have seen him though, as was is sitting in an adjacent street.)

Role in the Anime

Doctor as seen in the anime

In the anime, Doctor appears even more malevolent and ambitious than his manga counterpart. Yet, his sadism and his psychotic thirst for experimenting are replaced by more classical villainous traits, such as being overconfident, taunting his enemies and mocking their efforts, and a desire to control everything.

Given that the show eclipses the creation of both the nanomachines of immortality and the Phantom Star Brigade, Doctor's role in the Apostles is much less significant. He also appears to be less close to Creed than his manga counterpart, which can be explained by his involvement in the "Eden" Project. Strangely enough, Doctor does not display any power of Tao and the Warp World is never seen.

Doctor first appears during the Apostles' attack on the World Conference, in which he does not take part in the slaughter, and watches the confrontation between Creed and Train Heartnet from the sidelines, as with every other Apostle. Doctor takes part in the showdown in the old castle and later intends to punish the desertion of Kyoko, by shooting her with a bullet filled with nanomachines that would turn her into a monster.

However, Train takes the hit and turns back into a child. Contrary to the manga, the child metamorphosis has no incidence over the plot whatsoever and Train turns back to normal a while later, after merely taking a shower. During the battle of Clarken Island, Doctor releases many nanomachines-powered monsters after the sweepers.

After Creed's defeat, Doctor is revealed to be also part of the Zero Numbers, a villainous group created by Mason Ordrosso, the renegade Chrono Number XII, which worked more or less alongside the Apostles of the Star. Doctor is Mason's right-hand-man and the supervisor of the "Eden" Project. It appears that several years before the start of the series, Doctor (or to call him by his name, Kyosuke Kanzaki) was one of the scientists who worked under Dr Tearyu Lunatic.

Their goal was to create Eden: a gigantic, sentient, nanomachine-powered aircraft; which was supposed to unify the consciousness of every human being in the world into itself, through the use of nanomachines. Apparently the project was abandoned when Torneo Rudman (who in the anime was a terrorist after the project) attacked the laboratory.

In fact, Torneo was manipulated by Mason, who wanted to erase all evidence, while Doctor secretly kept working on the project, intending to combine nanomachines with the power of Tao. Finally, it is revealed that Eve's real purpose was to serve as a consciousness for Eden since the very beginning.

Doctor approaches Eve, who fled after having a row with Sven, before kidnapping and brainwashing her with drugs. (In the anime, Eve never met him beforehand.) He then binds her into Eden's core and the Zero Numbers enact their twisted project. Doctor remains all the time in Eden's control room, monitoring its very action as well as its assimilation of Eve.

Oddly enough, he activates all the functions by playing pool on a control board. When all the protagonists start their action against the Zero Numbers, Doctor unleashes countless monsters born from Tao and nanomachines. He later unleashes ghost-like monsters created from the consciousness of the people that Eden has absorbed.

Doctor transformed into a monster

When the protagonists reach the control room and confront the deranged scientist, he prepares to face them alongside the other Zero Numbers, despite them being clearly outnumbered, as they are all linked to Eden and will resurrect whenever they get killed.

Doctor then transforms into a huge, monstrous version of his human self and jumps into the battle. However, the Zero Numbers cannot prevent Train and Sven to go and confront Mason. Creed and Echidna appear to fight him, enabling Train to reach and destroy Eden's core. With Eden destroyed, Eve is freed and every Zero Number is destroyed along with it.