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Alien Conquerors Arc
During the S-Class meeting, Child Emperor is slightly disappointed in Blast's absence, which is later confirmed by Sitch who mentions his unknown whereabouts.
Monster Association Arc
Blast is mentioned in a Hero Association meeting. A staff member is frustrated at Blast's lack of activity despite being the top-ranked hero in the S-Class. Sitch says that Blast cannot be ordered around but has enough faith in Blast that should humanity be in peril, he will appear.
When Drive Knight asks whether or not Blast will appear if the Hero Association Headquarters is attacked, Sekingar says that it is not very likely, stating that Blast is more or less retired.
During Sweet Mask's mental breakdown, he has a vision of Blast telling him that everything is fine while a dead monster lays beside them. This could mean that Blast saved Sweet Mask from a monster in the past.
Tatsumaki also had a flashback of Blast when he saved her from a monster 18 years ago. This flashback and the advice Blast gave provide Tatsumaki with the motivation to continue fighting even though her body was giving up on her. An object that resembles the cube Blast was holding in Tatsumaki's flashback appears again during the Monster Association raid when Saitama pulls it out to free Flashy Flash's arm from some rubble. The cube is revealed to be extremely heavy, as it was able to get Flash's arm stuck, sink into the ground when Saitama drops it, and Manako was unable to lift it.
Blast suddenly appears to Saitama, Flash, and Manako after the voice of "God" speaks in their head due to their contact with the cube. He notes how he managed to make it in time and makes sure that they haven't accepted the deal yet. He briefly goes over the schematics of the cube and questions why Flash is so far below the ground. Flash then attempts to "test" the top-ranking hero using his fastest kicks, but Blast manages to dodge and appear behind him in an instant nonchalantly. He notes how time flows slower in the space they're in than outside and that he can take them to the surface. He also questions why they have a monster that's not their prisoner with them but leaves Manako after Saitama's explanation. He then generates a portal to teleport all of them, saying they would meet again and requesting the two heroes to send his regards to Sitch and Tatsumaki.
On the surface, Blast drops Saitama, Flash, and Manako near Garou before teleporting away to do his unknown business. Shortly later, he teleports to an unconscious Tatsumaki, who has just appeared to resist being tempted by "God", and checks on her condition. He is seen with some injuries that he didn't have when meeting Saitama and Flash before. He remarks on her growth while King and Saitama then notice his presence. Blast talks to them, stating that while he managed to hold "that thing" off at the brink, he allowed it to come in contact with Tatsumaki while he was in a time aperture created by the cube. Blast hands Tatsumaki off, telling King to take care of her and that he needs to go back and provide backup. While King questions what he meant, Blast steps through a portal that appears to have multiple people on the other side and states that he is not fighting alone shortly before teleporting away.
Later on, in another dimension, Blast and several others of his companions notice a disturbance upon Earth that distorts the magnetic and gravitational fields, caused by Garou's attack during his battle with Saitama. They then head toward an unknown seal that holds "God" within to repair it, in an attempt to prevent the entity from breaking out.
Afterwards, Blast emerges at the heroes' standoff with Garou, who has been empowered by "God", reaffirming Bang's suspicions that Garou is unconsciously being controlled by the mysterious entity. While further explaining Garou's existence would now endanger the life of all living things, and that the cosmic radiation emitted from him would kill the other heroes nearby, Blast offers the Hero Hunter to go into a different dimension to protect the Earth. As Blast notes that due to Garou still retaining some humanity, he surmises that the Hero Hunter must have managed to stave off full impartation of power from "God", wondering what would happen if he had allowed himself to be fully imparted. Garou denies Blast's offer, claiming that he was to become Disaster Level God and an enemy to humanity with the blessing of his new abilities. Bang attempts to stop Garou, but Blast warns him to stay back. At this moment, to Blast's surprise, Genos, using the remaining bits of power he has left, hurls himself towards Garou and headbutts him in the chest, although to no avail. When Garou picks a helpless Genos by the hair with the intent to kill, Blast attempts to protect the young S-Class and a fight ensues. He seems to gain the upper hand in the battle thanks to his exceptional speed and portal abilities. Still, Garou quickly adapts and copies his ability to create portals, creating a new powerful attack that combines Garou's power with Blast's, forcing the top hero to go on the defensive.
After a brief engagement in battle, Garou claims that Blast lives up to his Rank 1 position but isn't worthy of his time anymore. Knowing that Saitama will return, Garou picks up Genos again and kills the helpless cyborg by impaling him through his chest and tearing out his power core, in order to trigger Saitama to get serious and bring out his full strength. Shortly later, when Saitama finally returns from being launched away by Garou's Gamma Ray Burst, he is visibly distressed with the fact that he is too late to save his disciple and the other heroes while Blast warns the Caped Baldy to stay away, unaware of his strength. However, Saitama, now enraged, charges towards Garou with a Serious Punch, which the Hero Hunter immediately copies and responds with the same attack. Sensing the immense energy behind their fists, Blast becomes greatly concerned that their clash will destroy the Earth.
Using his portal abilities, Blast manages to quickly teleport Saitama, Garou, and himself outside Earth's atmosphere before their fists collide. When their fists finally make contact, the shock wave of energy released from the collision proves too much even for the highest-ranking S-Class hero to handle, although he is still trying to somehow alter the vector of the destructive energy away from the Earth. At this moment, three of Blast's companions show up and offer him help and together, they manage to redirect the immense energy away from the planet. As a giant circular hole appears out of nowhere in space, seemingly as a result of numerous star systems being wiped out by the diverted energy shock wave, Blast and his companions wonder how far Saitama and Garou have been sent flying from the recoil of their own punches.
Later, due to Saitama traveling to the past and defeating Garou before Blast could appear and fight the Hero Hunter again, therefore saving the other heroes from being killed by Garou's cosmic radiation and changing the Ominous Future, Blast currently does not have remembrance of what took place in the Ominous Future.
Psychic Sisters Arc
After becoming unconscious due to the exhaustion from her battle with Saitama, Tatsumaki sees Blast in her dream. She hopes that he will respect her after she has become as strong as she is now and will teach her a better way to live.
Ninjas Arc
Upon their arrival at the Hero Association Headquarters, Saitama, Flashy Flash, and Manako seek Sitch's assistance in contacting Blast, only to find him already present. Saitama expresses gratitude towards Blast for his assistance in rescuing them the other day. Blast acknowledges Saitama's immense strength and is glad to have him there. Sitch recalls Blast informing him about Saitama defeating Garou and warns of a looming threat greater than the Hero Hunter. Flash inquires about "God" to which Blast responds that Flash would not stand a chance against such a being. Nevertheless, he confirms Flash's suspicions of a connection between "God," the Ninja Village, and its leader, "That Man." He discloses that the leader of the Ninja Village, called Empty Void, was once his partner in the search for mysterious cubes before succumbing to God's influence. He accepts responsibility for the lives lost due to the Ninja Village's actions. He states that Void and he were evenly matched before the latter gained additional power from "God" and had an advantage during their fight in the past. Despite this boost in power, Blast still managed to defeat and give Void severe injuries that required the ninja leader 15 years to recover from. Flash accuses Blast of being lenient towards his former partner but he remains silent in response. It's revealed right afterward that Blast was at the headquarters to observe the Hero Association's experiment on the monsterized 22nd Super Fight contestants Benpatsu, Volten, and Hamukichi, to see if they could reverse monsterfication done by monster cells. He wishes to turn his partner back into human.
As they discuss, Blast senses an impending attack from Void targeting the Hero Association complex. In a swift move, he envelops the entire building in a massive portal, teleporting it away from danger. Following the attack, Blast returns the complex to its original location. When asked by Saitama if he can win against Void, Blast replies he will just figure it out. He recounts how he saved the Earth from Garou's excessive cosmic radiation emissions, followed by his brief encounter with Void soon afterward, who absorbed Garou's divine power and is now ready to confront him after making necessary preparations, before explaining the nature of Void's earlier attack, called Dimensional Slash. A challenge letter from Speed-o'-Sound Sonic arrives, mentioning the awakening of "That Man," who seeks Flash's life, and a personal challenge from Sonic to settle with Flash at a specific location known only to the latter. Flash suspects that Void is awaiting him at the place written on the back of the letter, distinct from the location privately known to him. Blast agrees with this suspicion, and he provides Flash a button to call him. He advises Flash to go alone first, as going together might alert Void. With Blast gearing up to face Void and Flash preparing to head to Sonic's whereabouts, Saitama casually decides to enjoy some udon with Manako while trusting Blast's capability to handle this dire situation.
Blast later appears to help Speed-o'-Sound Sonic and Flashy Flash from Empty Void's dimension slash.
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