S0E1 - Road to Hero
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.
S0E2 - The Shadow That Snuck Up Too Close
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.
S0E3 - The Student Who Sucks at Storytelling
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…
S0E4 - The Ninja Who Is Too Complicated
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…
S0E5 - Bang, Who Is Too Overbearing
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.
S0E6 - The Sisters Who Have Too Many Things Happening
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.
S0E7 - The Murder Case That Is Too Impossible
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.
S0E8 - A Super Serious Look Back!
One Punch Man 2nd Season’s commemorative recap special.
S0E9 - Saitama and Those with Reasonable Abilities
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.
S0E10 - Old Dudes and Fishing
Atomic Samurai and Bang go out fishing to a lake.
S0E11 - Genos and Memory Loss
As Genos and Saitama watch TV, Saitama accidentally knocks Genos out trying to reach his potato chips and Genos wakes up with memory loss.
S0E12 - Games and Rivals
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.
S0E13 - Puri Puri Prisoner and the Escaped Prisoners
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.
S0E14 - The Zombieman Murder Case 2: A Chalet Amid the Blizzard, and the Ones Bothered by the Cold
Child Emperor, Zombieman, Superalloy Darkshine, and Metal Bat are dispatched to a forlorn, snowy mountain to hunt down a monster.
