Saitama ma jeden cel: zostać superbohaterem. Po latach szkolenia staje się silny i stawia czoła przeróżnym potworom, aby chronić ludzkość.

Genos to potężny cyborg walczący o sprawiedliwość. Ale kiedy widzi Saitamę w akcji, prosi o możliwość zostania jego uczniem.

Doktor Genus dowiaduje się, że Genos i Saitama zamierzają go powstrzymać. Sięga więc po swoją przepotężną broń — potwora, którego nawet on sam nie potrafi kontrolować.

Utopiści to grupa pod dowództwem Glacy Młota, który marzy o świecie bez pracy. Naddźwiękowy Dźwięk staje z nimi twarzą w twarz, zabijając wszystkich poza jednym.

Genos i Saitama podchodzą do egzaminu na bohaterów. Saitama ledwo zdaje, ale doskonałe wyniki Genosa przyciągają uwagę Stowarzyszenia Bohaterów.

Stowarzyszenie Bohaterów wykrywa tajemniczą aktywność w wymarłej części Okręgu Z, więc wysyła tam swoich członków, by rozwiązali zagadkę.

Okręgowi Z zagraża uderzenie meteorytu. Bohaterowie klasy S usiłują zapobiec katastrofie humanitarnej, jednak ich wysiłki wydają się daremne.

Ziemi zagraża najazd potworów z głębin morza. Różni bohaterowie próbują je powstrzymać, ale wciąż ponoszą porażkę.

Król głębin pobił już wielu bohaterów i wydaje się niepokonany. Na szczęście do akcji wkracza Saitama.

A story about Saitama from when he still had hair and his only costume was a track suit. Several shops in Saitama’s neighbourhood have gone out of business and the owner of the last one left needs his help.

Bohaterowie klasy S zostają wezwani, aby rozprawić się z potencjalnym zagrożeniem — zgodnie z przepowiednią Shibabawy w ciągu sześciu miesięcy stanie się coś strasznego!

Pewne stworzenie opuszcza statek kosmiczny, który zniszczył Okręg A i atakuje bohaterów klasy S. Saitama wchodzi na pokład i zabija prawie całą załogę.

Podczas gdy bohaterowie walczą z Melzargaldem, Saitama musi stawić czoła przywódcy obcych, lordowi Borosowi, podczas epickiej walki.

A story set sometime between Mosquito Girl’s defeat and Genos showing up to Saitama’s apartment. Genos wants to learn the secret to Saitama’s power and decides to follow him and to observe everything he does. At the same time, Saitama is convinced that someone is stalking him.

Jenosu it accidentally trapped in Don Pacino a little bit caught in the Mafia of conflict. Jenosu that are in a hurry the shopping asked the bargain in Saitama’s to explain to Don Pacino, but…

Sonic strive to strict training muffled to the mountain, but had spent the days of troubled with nightmares to be a nasty blow to the groin from Saitama who suffered a defeat. Man of Matagi had seen such a situation. He is also “formidable enemy” in defeated in the past of the owner…

After the events of episode 7, Bang begins to spy on Saitama and Genos to gauge their abilities. Hopeful that his Water Stream Rock Smashing Fist martial arts is stronger, and that proving so will coerce Saitama and Genos to study under him, Bang invites Saitama and Genos to his dojo under the pretense of giving them free meat.

During a coincidental train ride, Genos and Fubuki are put to the test when an anti-Hero Association group plants a bomb on the train.

Child Emperor investigates the murder of Zombieman. When Saitama is put under suspicion, Genos promises that he will vouch for Saitama even if he’s the culprit.

One Punch Man 2nd Season’s commemorative recap special.

Saitama is out shopping with Genos in tow when the pair come across G4, a demonic robot on a mission to eliminate King. Elsewhere, Sitch attempts to recruit various cutthroats, villains and assassins of the underworld to help the Hero Association.

Garou issues a declaration of war on the Hero Association through terrifying means, Hellish Blizzard gives Saitama an ultimatum, and Genos decides to eliminate his master’s stalker, Speed-o’-Sound Sonic.

Monsters from the Monster Association launch simultaneous attacks on all the human cities, attempting to overwhelm the forces of the Hero Association. Meanwhile, the “Super Fight” martial arts tournament kicks off.

The Super Fight tournament kicks off while Genos takes on multiple monsters who have appeared in City C. Elsewhere, countless monsters are wreaking havoc in multiple areas, but the Hero Association is being overwhelmed by the sheer number of threats.

Just as Suiryu finds himself in the depths of despair, Saitama suddenly appears to help him out. But despite all Saitama’s strength, there’s still something bugging the hero that he just can’t seem to shake.

The Monster Association issues a challenge to the Hero Association, telling them they have only three days to rescue the hostage Waganma. Elsewhere, Garou tries to recover from his constant fighting, but things don’t quite go as planned.

Silverfang and Bomb catch up with Garou while the hero hunter is battling Genos, starting a whirlwind battle that draws in more and more combatants as it marches towards its hair-raising climax!

Saitama meets a group of villains in a public restroom who mistake him for their ally, they introduce themselves to Saitama, but when he reveals he’s a hero, attempt to defeat him.

Atomic Samurai and Bang go out fishing to a lake.

As Genos and Saitama watch TV, Saitama accidentally knocks Genos out trying to reach his potato chips and Genos wakes up with memory loss.

Saitama brings Genos to a tournament for the fighting video game “Wild Animals” due to the grand prize being five million yen. Several locations all over the country are being used as venues, and the battles take place online.

One stormy night, a monster emerges from a junkyard and begins making its way towards Smelly Lid Prison. Noticing its approach, Puri-Puri Prisoner breaks out of his cell and quickly defeats the monster. However, he damages the prison’s electricity in the process, allowing a handful of inmates to escape.

Child Emperor, Zombieman, Superalloy Darkshine, and Metal Bat are dispatched to a forlorn, snowy mountain to hunt down a monster.