A hero becomes so strong from training that he can take out his worst foes with one punch, but strength has lost him his hair and fighting passion.
S01:E01 - The Strongest Man
After saving a child from certain death, Saitama decides to become a hero and trains for years.
S01:E02 - The Lone Cyborg
A monster created by an organization is going to City Z.
S01:E03 - The Obsessive Scientist
Saitama and Genos glean information about The House of Evolution and its founder, Dr. Genus.
S01:E04 - The Modern Ninja
A group of battlesuit-clad terrorists called The Paradisers appears in City F.
S01:E05 - The Ultimate Master
Saitama decides to become a professional hero and takes the test with Genos.
S01:E06 - The Terrifying City
Saitama has become a professional hero, but has yet to do anything heroic.
S01:E07 - The Ultimate Disciple
An enormous meteor hurtles toward City Z forcing S Class heroes to respond.
S01:E08 - The Deep Sea King
A pack of monsters arrive on the shores of City J intent on invading the land.
S01:E09 - Unyielding Justice
As the battle with the Deep Sea King reaches its climax, more heroes fall.
S01:E10 - Unparalleled Peril
Saitama attends an emergency meeting of Class S heroes; a seer foretells a serious danger.
S01:E11 - The Dominator of the Universe
A spaceship floats above City A, and a member of its crew battles a group of S Class heroes.
S01:E12 - The Strongest Hero
Lord Boros searches for someone who can cure his boredom.