Zombieman/Synopsis

History
Zombieman was created by Dr. Genus in the House of Evolution and was known as Subject No. 66. He was the only success of the immortal series. Ten years ago, he managed to escape, leaving behind a destroyed lab.

He once fought against a Mysterious Being in a fierce battle for 140 hours and emerged victorious. This event made him a bit famous.

Alien Conquerors Arc
Zombieman first appears at the S-Class Hero Association meeting, commenting on the lack of cooperation among the heroes. Later, Sitch explains the matter of the meeting, stating the seer Shibabawa has died, which shocks Zombieman, who questions the cause of death.

Monster Association Arc
Zombieman arrives in W-City to track Marshall Gorilla, who left the field of battle to another side of the city to hunt other heroes. As he plans his course of action while trailing Marshall Gorilla, his plans hit a snag when the latter runs into one of the House of Evolution's test subjects, Armored Gorilla. After Armored Gorilla knocks out Marshall Gorilla, Zombieman decides to trail Armored Gorilla to the House of Evolution's hideout.

Upon finding the House of Evolution's hideout by trailing Armored Gorilla, he decides to act on his intent to eliminate them once and for all and confronts Armored Gorilla. Armored Gorilla informs him that the House of Evolution Zombieman once knew had already been defeated, much to the hero's surprise. Zombieman confronts Dr. Genus and demands to know how the House of Evolution was defeated and why Dr. Genus had not rebuilt it.

Genus tells Zombieman that he had witnessed a power more amazing than artificial evolution and that his research had lost. He explains to Zombieman the concept of the limiter, and that he had encountered a person, Saitama, who had succeeded in removing his. An unconvinced Zombieman sarcastically asks Genus if this person was strong enough to blow away Genus' whole ideology and had achieved such strength with no compensation, to which Genus tells him that the price this person had paid was that he became bald and suffered an overwhelming feeling of alienation. Zombieman is unamused by this, telling Genus he has lost it, and that he knows of many people that disregard their limits. Genus corrects him, explaining that these people were born with the possibility of becoming that powerful or had achieved it through mechanizing their body or human experimentation. However, this person, through effort alone, had broken past his natural limits, adding that he seems to be working as a hero now. A frustrated Zombieman asks why Genus started a Takoyaki shop. Genus tells him that he was researching cloning and had successfully created an unlimited amount of octopus tentacles.

Zombieman catches a train to attend the S-Class meeting. Zombieman arrives to the meeting with Kamikaze, Tatsumaki, Child Emperor, Pig God, Flashy Flash, Superalloy Darkshine, Puri-Puri Prisoner and Sekingar and reassure Narinki that they will save his son. He receives a transmitter from Child Emperor. Zombieman warns the others to not be careless lest they be beaten and they need to focus on their objective of saving Waganma. Sweet Mask barges into the meeting and demands to lead the underground strike force to which Zombieman opposes as he doesn't want dissension amongst the group. Sweet Mask lays out his suspicion on Zombieman and accuses him of being a monster. Zombieman leaves with various other heroes to attack the Monster Association. Zombieman arrives at the ghost town within Z-City. He defeats a few more monsters before encountering Pureblood. He fires his guns but is easily outmaneuvered by the vampire, who dodges his bullets and bites into his neck. However, instead of feeding off of Zombieman, Pureblood knocks him to the ground, expressing disgust at his blood. Zombieman casually gets to his feet before loading his gun and firing at Pureblood again. This time, Pureblood catches and releases his bullets back at him, and they hit him in the face and chest. Once again, Zombieman regenerates the damage, and the fight continues. As they fight, Pureblood mocks Zombieman, telling him there's nothing to write home about aside from his regeneration before snapping his neck with a kick. This time, Zombieman manages to shoot Pureblood in the chest. Pureblood then sends a swarm of bats to collect blood from Zombieman and the other monsters in the room, but the bat that attacks Zonbieman gets stuck in his shoulder, ultimately being absorbed into his arm due to his regeneration. Zombieman then tells his opponent to prepare for a battle of attrition and 30 minutes later, he stands victorious in the middle of a bloody wrecked room with an axe slung over his shoulder. After taking about 200 fatal wounds from Pureblood, he decides to rest, saying 3 minutes are needed for automatic full recovery. He is then attacked by several monsters and manages to kill them all. He tries to rest, but is attacked by two enemy robots with parts repurposed from Metal Knight's machinery. He defeats the robots and then contacts Child Emperor, praising him for his spot-on analysis of the situation which proved instrumental in taking down the robots. Zombieman thanks Child Emperor and offers to treat him to milkshakes after they defeat the Monster Assocation. Child Emperor updates Zombieman on his own progress, stating that he's doing fine. After disconnecting the call, Zombieman remarks that the young hero is doing good and expresses relief at not being the only hero taking this matter seriously. He says to himself that it's time to go on another rampage

Zombieman wanders around, wondering what the rumbling noise is about. Suddenly, Homeless Emperor is behind him who then blasts him with his energy spheres. He immediately gets up, much to his new opponent's surprise. He then asks how Homeless Emperor came to acquire such enormous power. It was a plan to stall time for his regeneration to work, but he comes to learn that a "God" had granted Homeless Emperor his "Divine Power". Unfortunately, Homeless Emperor had finished talking before Zombieman could fully recover and the two proceed to fight once again. Despite his best efforts, Zombieman is completely overwhelmed by Homeless Emperor's energy blasts and fights a losing battle. While they are fighting, Tatsumaki's barrier appears and wraps itself around Zombieman's transmitter. Homeless Emperor is curious as to why a barrier's protecting nothing on the inside, but Zombieman realizes that Tatsumaki must be trying to help him and is pinpointing his location based on the transmitter. But since his clothes were destroyed, and his transmitter was in his pocket, it isn't protecting the hero, and he laments that had he known that was how she was tracking him, he would've planted the transmitter inside his skull.

Fortunately for Zombieman, Pig God had stayed underground to search for other heroes, and he eats Zombieman, taking him, Iaian, and Narinki's private squad up to the surface, where he regurgitates them. After regenerating, Zombieman expresses happiness at Tanktop Master's arrival and compliments Sweet Mask after the latter manages to motivate Superalloy Darkshine into fighting again. Child Emperor asks Zombieman to take over command of the operation, but Zombieman turns him down and reassures him, stating that the young hero is improving by recognizing his faults. When Homeless Emperor attacks, Zombieman pushes Child Emperor out of the way and takes the brunt of the attack, which destroys part of his body. Zombieman tells Child Emperor to run as his tries to drag him away, but Fuhrer Ugly crushes him under his foot. Homeless Emperor then launches a massive energy attack at the two heroes, seemingly ending them. Later, when King is confronting several Monster Association executive members and is about to be attacked by Homeless Emperor, Zombieman bursts out of the ground behind the latter and pins him down. As Zombieman restrains Homeless Emperor, who is shocked to see he managed to survive, Child Emperor is also delighted upon his return. Zombieman tells Homeless Emperor that it was difficult for him to die and that he unfortunately will have to endure his presence longer. Homeless Emperor, unable to break free from his hold and cannot attack him with his energy spheres due to the close proximity between them, calls for Black Sperm's assistance to get Zombieman away from him, in which the black monster silently refuses so as not to lose his focus on King. As Black Sperm begins merging over 11 trillion of his cells along with Golden Sperm for the birth of Platinum Sperm, Zombieman claims to Homeless Emperor that not even the new fusion can stand a chance against King, stating that their efforts are futile before the famous hero's overwhelming strength. However, Homeless Emperor responds to him that King is being cautious and observing, stating that even a single Black Sperm is strong enough to take on an A-Class hero, and with so many clones combined, their power would be unimaginable. Homeless Emperor then offers Zombieman a quick and painless death as he tells him to let go of him, though Zombieman replies that he still has several questions and starts interrogating the nature of his powers. Before Homeless Emperor could say anything, "God" appears in his mind and takes his life along with his powers, marking his death as his body disintegrates before Zombieman's very eyes. Zombieman, seeing his strange death, wonders the existence of someone who granted Homeless Emperor his light powers.

Original Webcomic
As the self-proclaimed "God Level Threat" Monster Garou defeats one hero after another, Zombieman steps up to stop him while knowing it is futile. As a result, he is reduced to a bloody pile in a matter of seconds. He recovers just in time to witness Saitama perform his Serious Table Flip.

Seeing Saitama has no intentions to kill Garou, Zombieman offers to kill Garou for him. However, Saitama and Bang refused to kill Garou because of having an empathy for Garou, understanding how he feels and what he truly wants; besides realizing he had saved a child whom the heroes thought to be kidnapped and about to be killed by Garou, thus letting him get away.

Psychic Sisters Arc
By the time the Hero Association is about to fall soon enough, Zombieman returns to Genus informing him of what the former doctor said to him about how Saitama's power being reached through the removal of his limiter was true, and begged the doctor to make Zombieman's power equal to Saitama by having his limiter removed. However, Genus told Zombieman that in order for the hero to be on par with Saitama he'd have to do so under certain conditions after which he takes Zombieman to the basement of his Takoyaki shop.

Neo Heroes Uprising Arc
He is later seen in the basement vomiting blood, his left arm torn off and his body dealt serious damage, presumably due to the grueling task of attempting to remove his limiter, while Dr. Genus watches close by.