- Cast: Makoto Furukawa, Kaito Ishikawa, Kazuhiro Yamaji, Yuichi Nakamura, Kenjirou Tsuda
- Country: Japan
- Production: J.C.Staff
- Type: Anime
- Episode: 12
- Duration: 24 min.
The third season of One Punch Man. Saitama is a hero who only became a hero for fun. After three years of “special training,” he’s become so strong that he’s practically invincible. In fact, he’s too strong—even his mightiest opponents are taken out with a single punch. Alongside Genos, his faithful disciple, Saitama performs his official hero duties as a member of the Hero Association. One day, monsters claiming to be from the Monster Association suddenly appeared, taking a child of Hero Association executive hostage. The S-class heroes gather and plan a raid on the Monster Association hideout to rescue the hostage. Meanwhile, Garou, a “human monster” who was taken by the Monster Association during a battle with the heroes, awakens in the Monster Association hideout.