The Human Monster

At the Association meeting, Garou proclaims himself an ally of monsters and an enemy to everyone else, thrashing the assembled criminals and Sitch's guards with his martial arts before leaving Sitch alive to spread his legend. Meanwhile Saitama plays a borrowed handheld at home when Genos answers the door to find Sonic hunting for Saitama. As the two speed off to fight, Fubuki, leader of the Blizzard Group and B-Class Rank 1, arrives to press Saitama into joining her faction. He refuses, and when her underlings Eyelashes and Mountain Ape attack, he flattens them in a single blow, remaining unmoved even by her psychic assault. He scolds her for propping up her strength with followers, warning that they will be useless against a truly superior foe.

An explosion from the Genos and Sonic clash nearly catches Fubuki, but Saitama shields her unharmed. Genos introduces himself as Saitama's disciple, baffling her, then trades blows with Sonic, slicing off his ponytail before Sonic answers with faster afterimage clones. When Genos prepares a massive explosion, Saitama knocks him down to spare the apartment and takes over the fight himself, countering Sonic's advanced clone technique with his Serious Side Hops and dropping the ninja in an instant. Afterward Fubuki reveals that she is Tatsumaki's younger sister and gathers allies because she cannot match her overwhelming sibling. Her final recruitment attempt fails just as King arrives to reclaim his console, which Saitama admits he broke while erasing the save data. The Association then dubs Saitama "Caped Baldy" and Genos "Demon Cyborg," and the episode ends with Garou downing Tanktop Vegetarian.

Garou openly begins his campaign against the heroes, and Saitama decisively defeats Speed-o'-Sound Sonic. Fubuki's rivalry with her sister Tatsumaki is revealed, and Saitama and Genos receive their official hero names, Caped Baldy and Demon Cyborg.

Garou's childhood flashback about the show Justice Man was moved to Episode 16 so it would not break up his rampage at the headquarters. By the time Sitch calls for backup, Garou has already cleared the room, and a continuity oddity has Fubuki's group citing Saitama's updated rank despite earlier reading a flyer listing him at 33.