Saitama possesses strength so extreme that nothing can stand in his way, but he gets no respect. He joins the Hero Association with mixed results.

1. The Strongest Man 24m Saitama is determined to become a superhero. After years of training he becomes strong and faces all sorts of monsters to protect humanity.

2. The Lone Cyborg 24m Genos is a cyborg who fights for justice. After having seen Saitama in action, he asks if he can become his student.

3. The Obsessive Scientist 24m Hearing that Genos and Saitama are heading over to stop him, Doctor Genus releases his ultimate weapon -- a monster that even he can’t control.

4. The Modern Ninja 24m The Paradisers are a group of men led by Hammerhead who want a world without work. Speed-o'-Sound Sonic confronts them and kills them all except one.

5. The Ultimate Mentor 24m Genos and Saitama take the exam to become heroes. Saitama barely scrapes by, but Genos’s high scores attract the attention of the Hero Association.

6. The Terrifying City 24m The Hero Association detects intense mysterious activity in the ghost quarter of Z city and sends some of its members to resolve the matter.

7. The Ultimate Disciple 24m Z city is threatened by a meteorite. The heroes of class S try to prevent a human catastrophe, but all their attempts seem to be in vain.

8. The Deep Sea King 24m The Earth is threatened by the arrival of the abyssals from the sea. Various heroes try to stop them, but they are regularly defeated.

9. Unyielding Justice 24m The king of the abyssals, after having defeated many heroes, seems really unbeatable. Fortunately, Saitama gets involved.

10. Unparalleled Peril 24m The heroes of class S are summoned to respond to a major threat: Shibabawa has foreseen a great danger set to occur some time in the next six months!

11. The Dominator of the Universe 24m A creature leaves the alien spaceship which destroyed city A and attacks the heroes of class S. Saitama gets on board and kills most of the crew.