Watch One Punch Man Season 1 English Dubbed: On an Earth-like super-continent planet, strange monsters have been mysteriously appearing and causing disasters resulting in the world’s superheroes rising to combat them alongside the local supervillains. Saitama, the protagonist of the series, is the strongest hero alive in the entire franchise, hailing from the metropolis of City Z who easily defeats the monsters or other villains with a single punch to the point where monsters just explode when struck. However, due to his limitless strength, Saitama has become bored with his power and is constantly trying to find stronger opponents who can present a challenge to him.
As Saitama is active as a hero, he meets various other heroes and villains. He gets a disciple in the form of the cyborg Genos and consequently joins the Hero Association in order to gain official recognition. Despite defeating many strong monsters that even the Heroes Association’s top members are unable to defeat, Saitama struggles to gain respect. Most people look down on him due to his plain physical appearance and some accuse him of being a counterfeit hero. Only a small number of individuals in the series recognize his talent and humility towards others.