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12 Episodes 2015 - 2015
Episode 0
12 mins
Genos trying to find out the secret to Saitama's power by stalking him.

Episode 0
12 mins
Child Emperor investigates the murder of Zombieman.

Episode 0
24 mins
Before Saitama became a hero, his local tailor tells him that he must close up shop due to pressure from a local gang and Saitama decides to help him out.

Episode 0
12 mins
A story about Genos when he meets Don Pacino, a C class wanted criminal and his gang in a warehouse along with man who is being held captive by the gang.
Episode 0
12 mins
Silverfang stalks and pursues Saitama and Genos to come to his dojo where he tries to compete with Saitama in old martial arts ways.

Episode 0
12 mins
Story goes around frustrated Fubuki because of her elder sister Tatsumaki. Showing domination of elder sister over little one.

Episode 0
12 mins
Sonic faces his fear and meets a new friend.
Episode 1
Mon, Oct 5, 201525 mins
Saitama is a guy who is a hero for fun. After saving a child from certain death, he decided to become a hero and trained hard for three years. Though he's now so strong he can defeat any opponent with a single punch, lately he feels as if, in exchange for overwhelming power, he's lost something even more important.

Episode 2
24 mins
A monster is moving toward City Z--one that has been created by the mysterious organization known as The House of Evolution.

Episode 3
24 mins
Saitama and Genos glean information about the House of Evolution and its founder, Dr. Genus.

Episode 4
24 mins
A group of Bald thugs use body armors to terrorize rich people. Sonic Speed, a hired ninja fights them. Unfortunately he meets with Saitama who is also a Bald.

Episode 5
24 mins
Saitama and Genos find out about the hero registration and both took the tests to certify. Genos got "S(Special)" and Saitama got "C" grade. Meanwhile, Genos became the disciple of Saitama and learned about the power of saitama's punch on a training session.

Episode 6
24 mins
To remain on the "Hero" list Saitama has to show some activity in every week. Currently the City Z is defined as the 'ghost town'. Heroes are gathered together to find out whats going on.

Episode 7
24 mins
A giant meteor threatens to destroy City Z. All S-Rank heroes are called to City Z to destroy the meteor before its collision.

Episode 8
24 mins
Several Sea Folk appear and begin attacking citizens. They are easily defeated until The Deep Sea King appears and defeats many heroes including an S-Class.

Episode 9
24 mins
The fight with the Deep Sea King concludes and Saitama and Genos reflect on it as well as Saitama's promotion to B-Class.

Episode 10
24 mins
Saitama and all class S heroes are gathered together to be informed of an imminent extremely danger threat.

Episode 11
24 mins
An alien conqueror lands in a spaceship to conquer the Earth during the S class heroes meeting.

Episode 12
24 mins
Saitama takes on the alien leader in epic battle as the S class heroes fight the alien warriors and destroy the spaceship.

Episode 13
24 mins
Before Saitama became a hero, his local tailor tells him that he must close up shop due to pressure from a local gang and Saitama decides to help him out.
Episode 16
12 mins
Sonic faces his fear and meets a new friend.
Episode 17
12 mins
Silverfang stalks and pursues Saitama and Genos to come to his dojo where he tries to compete with Saitama in old martial arts ways.
Episode 18
12 mins
Story goes around frustrated Fubuki because of her elder sister Tatsumaki. Showing domination of elder sister over little one.
Episode 19
12 mins
Child Emperor investigates the murder of Zombieman.