The story of Saitama, a hero that does it just for fun & can defeat his enemies with a single punch.
Cast: Makoto Furukawa, Max Mittelman, Kaito Ishikawa, Zach Aguilar, Yôji Ueda, Shin'ya Hamazoe, Yoshiaki Hasegawa, Kyle Hebert, Shôta Yamamoto, Marc Diraison, Hiroki Gotô, Landon McDonald, Kanami Satô, Kaede Yuasa, Xanthe Huynh, Hiromichi Tezuka, Robbie Daymond, Chris Cason, Kirk Thornton, Marieve Herington, Ray Chase
As the fight continues between Garou and his former master, Bang, a prominent threat from the Monster Association reappears.
Garou continues his fight against the A Class heroes while some prominent S Class heroes make special entrances.
The Monster Association issues a challenge to the Hero Association, telling them they have only three days to rescue the hostage Waganma. Elsewhere, Garou tries to recover from his constant fighting, but things don’t quite go as planned.
Saitama returns to the battle, but is starting to get through a gloomy state because of an obvious reason.
Goketsu, the first Super Fight Tournament champion, arrives in the stadium. Having now become a monster, he's aiming to force the Super Fight competitors to turn into monsters themselves. When several do, it's up to Suiryu to take them on alone.
As the Super Fight tournament heads for its grand finale, the Class S heroes battle to hold back the tide of monster incursions. Meanwhile, Atomic Samurai is setting in motion a plan of his own.
The Super Fight tournament kicks off while Genos takes on multiple monsters who have appeared in City C. Elsewhere, countless monsters are wreaking havoc in multiple areas, but the Hero Association is being overwhelmed by the sheer number of threats.
Metal bat fights Garo. A lot of monsters surface around multiple cities and it is difficult for all the heroes to fight them. Meanwhile, Saitama is at the tournament and Genos is in the audience.
Assigned to guard a VIP and his son, Metal Bat couldn't be less thrilled. But when the group is suddenly attacked all hell breaks loose. Meanwhile, Saitama has disguised himself as Charanko in order to enter the "Super Fight" martial arts tournament.
Goro attacks the S-rank hero Tank top Master, his followers, and Mumen Rider. Goro continues his pursuit of attacking heroes. Saitama buys a wig to join a martial arts tournament after having a brief exchange with Goro.
Garou issues a declaration of war on the Hero Association through terrifying means, Hellish Blizzard gives Saitama an ultimatum, and Genos decides to eliminate his master's stalker, Speed-o'.
Saitama and Genos are out shopping when they come across G4, a demonic robot on a mission to eliminate King. Meanwhile, Sitch attempts to recruit various assassins and villains.