|— Orochi to Saitama.|
After being defeated by Tatsumaki, Gyoro Gyoro calls out to Orochi to save him but to no avail. He wonders why Orochi is not coming to assist him, for he managed to obtain absolute control over him from years of brainwashing during his transformation into a monster. Unbeknownst to him, Orochi took notice of Saitama being able to defeat Overgrown Rover. Orochi says he does not know how Saitama managed to get in, but he can tell that Saitama is not useless trash that can be ignored.
Orochi starts the fight by attacking Saitama with four dragon heads, only for them to quickly be destroyed by the hero. While Orochi expresses his surprise, Saitama informs him that he lives right above where they stand and complains about the noises Orochi has been causing. As Orochi begins feeling a mysterious pressure from Saitama, Overgrown Rover awakens from being punched into submission earlier. He then witnesses Overgrown Rover run away from Saitama out of fear upon seeing him and asks him if he had done something to the dog. Saitama responds that he had just given Rover a smash due to its bad behaviour.
With his good sense of perceiving things, Orochi manages to figure out that Saitama is the one who defeated Gouketsu and Elder Centipede, further realizing that the rumors about the "Ghost Town Horror" weren't referring to any other monsters but Saitama himself. Now realizing that the hero's strength is far beyond anyone he has encountered before and delighting that he has finally met him, Orochi takes off his mask and leads Saitama to deep underground where a mysterious shrine is located.
After arriving at the place where the surrounding areas are flooded with lava, Orochi explains to him that he had discovered a tablet which depicted him and stated that a worthy sacrifice was needed in order to resurrect God, leading him to believe that it was referring to him as a god. He then claims that Saitama is going to be a sacrifice for his resurrection and offers him an all-out fight. However; Orochi realizes that Saitama hasn't even paid attention to what he was saying as the hero is just trying to adjust to the environment around him while submerging himself in lava.
After being confused by Saitama's very casual behaviour, he decides to use his full power and intends to quickly finish the fight by pulling up energy directly from the Earth's core and dragging them into his body. The act of him pulling energy from the Earth causes a worldwide earthquake which is noticeable by seemingly everyone on the planet. After gathering enough energy, Orochi unleashes his Gaia Cannon, a massively powerful energy attack at Saitama in an attempt to eliminate the hero. In response, Saitama meets the attack using a serious move, Serious Squirt Gun, completely canceling Orochi's Gaia Cannon and leaving him shocked after the clash. Immediately after, Saitama jumps towards the Monster King and blows him apart with a single punch, ending their battle.
Having defeated Orochi with a single punch, Saitama expresses his gratitude to the Monster King for giving him a good bath shortly before leaving. Orochi notices that the place is beginning to crumble. He then crawls up to the mysterious shrine in an attempt to protect it from being collapsed. When he is right before the ancient tablet, an image of God appears in the wall and is unseen by him.
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Orochi and his dragons on his left hand strike with the newly-learned Water Stream Rock Smashing Fist. However, Saitama manages to kill all of the dragons with his punches. Orochi's dragons on his right hand fire several beams of energy. The force of the dragons combining their energy beams creates a huge blast, as well as creating several lightning bolts. Throughout the Monster Association Headquarters, these bolts of lightning strike several heroes, such as Atomic Samurai, who blocks the bolts with his sword, Bang and Bomb, who redirect or destroy the bolts with their respective martial arts, and Tatsumaki and Gyoro Gyoro, who protect themselves with psychic barriers. The energy blasts also elevate the terrain below Z-City and cause the buildings to rise, as well as destroy many other buildings in the process.
While this is happening, a train on the metro system feels the shockwaves of the attack. The conductor of the train puts the brakes on the train and notices the huge circular path in front of them that destroyed the train track. They also notice a figure blur past them, that figure being Saitama, who is running towards Orochi. The hero then jumps up and prepares to strike Orochi's head with a single punch. The Monster King uses some of his dragons to try and stop Saitama, but Saitama destroys all of them.
Orochi and his remaining dragons prepare to finish Saitama with a combined attack and release a combined energy blast that goes downward. Unfortunately for Orochi, Saitama manages to power through the energy blast and punches Orochi, destroying the monster's body. As Orochi's head and his broken body are floating in the air, Orochi asks Saitama what he just used. Saitama replies that it was simply a normal punch. As Orochi's head and the rest of his body fall down the pit, the monster realizes that at that moment, he is feeling terror. Saitama watches from a ledge as Orochi falls down to his defeat, making the bald hero the victor once again.
Gyoro Gyoro sends one of his eyes to look for Orochi only to find his remains, believing that he died. When looking for the hero that killed him, he sees Saitama who mistakes his eye for a bug and crushes it by clapping his hands together. When Gyoro Gyoro notes on Saitama's bald appearance, Tatsumaki wonders if he is referring to Superalloy Darkshine, giving him the credit for Orochi's defeat.