Boros continues to fight with Saitama, which leads to Boros losing an arm. The fight continues on, even reaching the point where Saitama finds himself on the moon, but he quickly returns. Meanwhile, Mumen Rider, Stinger, and Lightning Max rescue the last of the City A survivors. Tanktop Master tries to attack the ship by throwing a piece of rubble at it, only for Tatsumaki to throw dozens of pieces of rubble at the ship. The fight between the heroes and Melzargard concludes when Bang recovers and destroys his final marble, killing him. The fight between Saitama and Boros continues and it is revealed that Boros has regenerative powers. Eventually, they are both forced to use their most powerful moves. Saitama emerges victorious, and Boros admits he was not even close to Saitama. After the fight, Drive Knight warns Genos that Metal Knight is his enemy. Amai Mask appears and blames the S-class heroes for the destruction of City A, nearly causing a fight which is interrupted by Metal Knight who emerges to salvage parts of the ship. Meanwhile, Superalloy Blackluster discovers alien survivors whom Amai Mask promptly executes. Genos sees his past self in Amai Mask. Saitama emerges from the ship to find Tornado having a tantrum, and Genos quickly begins an argument with her; Bang interrupts before it can escalate into a fight. The parts Metal Knight salvages from the ship are used to rebuild the hero HQ which takes the place of City A which is wiped off the map. The A and S Class heroes are invited to stay in the newly rebuilt hero HQ. In the post-credits, Saitama destroys Pluton: King of the Underworld with one punch, much to his irritation.