In the One Punch Man anime series, Episode 12 serves as the climactic finale for each season, typically featuring Saitama's most significant battles against major threats to humanity.
: Boros realizes Saitama was holding back the entire time, noting that it wasn't a "hard-fought battle" for Saitama. This reinforces the series' core theme of Saitama's ongoing boredom and isolation due to his overwhelming strength.
: The Hero Association headquarters is rebuilt in City A. A post-credits scene features Saitama easily defeating a new monster, Pluton, signaling a return to his "one-punch" daily routine. Season 2, Episode 12: "The Wiping of the Disciple's Butt" One Punch Man Episode 12
: Saitama faces Lord Boros, the leader of the Dark Matter Thieves. Unlike previous foes, Boros survives Saitama's initial attacks, leading to an epic confrontation that includes Saitama being kicked to the moon.
: To end the fight, Saitama uses his "Serious Series: Serious Punch," which overpowers Boros’s "Collapsing Star Roaring Cannon" and disintegrates the alien leader . In the One Punch Man anime series, Episode
The final episode of the first season is widely considered one of the greatest anime fights of all time due to its high-quality animation by Madhouse.
: Reviews were mixed; while the character development for Garou and King was praised, some fans felt the ending was less climactic than the Season 1 finale. Season 3, Episode 12: "Ultimate Lifeform" : The Hero Association headquarters is rebuilt in City A
The Season 2 finale focuses on the culmination of the "Hero Hunter" arc and the introduction of a massive monster threat.