The Strongest Hero.Boros starts to fight with Saitama, which leads to Boros losing an arm. The fight continues on, even reaching the point where Saitama is kicked all the way to 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 before he could regenerate from Atomic Samurai’s attack, killing the monster for good. The fight between Saitama and Boros continues and it is revealed that Boros has regenerative powers. Eventually, they both use their trump cards, with Saitama’s Serious Punch overwhelming Boros’ Collapsing Star Roaring Cannon, an energy attack capable of destroying an entire planet. As Saitama emerges victorious, Boros admits he was not even close to Saitama’s strength before dying. 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 with Metal Bat which is interrupted by Metal Knight, who emerges to salvage parts of the ship. Meanwhile, Superalloy Darkshine discovers alien survivors whom Amai Mask promptly executes. Genos sees his past self in Amai Mask...