A pack of monsters calling themselves the 'Clan of the Seafolk' arrive on the shores of City J intent on invading the land. When the hero sent to fight them is defeated easily by the Deep Sea King himself, Saitama and Genos head for the city to help.

One-Punch Man Season 1 Episodes...

• s01e01 - The Strongest Man
• s01e02 - The Lone Cyborg
• s01e03 - The Obsessive Scientist
• s01e04 - The Modern Ninja
• s01e05 - The Ultimate Master
• s01e06 - The Terrifying City
• s01e07 - The Ultimate Disciple
• s01e08 - The Deep Sea King
• s01e09 - Unyielding Justice
• s01e10 - Unparalleled Peril
• s01e11 - The Dominator of the Universe
• s01e12 - The Strongest Hero

One-Punch Man Show Summary

Saitama is a superhero who has trained so hard that his hair has fallen out, and who can overcome any enemy with one punch. However, because he is so strong, he has become bored and frustrated that he wins all of his battles too easily.