10 : Unparalleled Peril Apr 2026

: For the first time, we see nearly all the S-Class heroes in one room—from the bratty psychic Tatsumaki to the stoic Silver Fang and the elusive Metal Knight .

is the tenth episode of the first season of the popular anime series One-Punch Man . It originally aired on December 7, 2015, and serves as the explosive beginning of the "Alien Conquerors" arc. 10 : Unparalleled Peril

In this episode, the S-Class heroes are summoned to the Hero Association headquarters for an emergency meeting regarding a prophecy by the great seer Shibabawa: "The Earth is in peril!". Almost immediately, a massive alien spacecraft appears above City A, obliterating it in seconds. While the top-tier heroes scramble to deal with the threat on the ground, Saitama simply jumps through the bottom of the ship to deal with the invaders himself, setting the stage for the series' most iconic battle. : For the first time, we see nearly

: On the ground, heroes like Atomic Samurai and Puri-Puri Prisoner face off against the regenerating alien general Melzargard. In this episode, the S-Class heroes are summoned