One Punch Man Manga Chapter 78

Speed-o’-Sound Sonic is confronted by his former ninja comrades, Gale Wind and Hellfire Flame, now transformed into monsters. They urge him to join the Monster Association and kill Flashy Flash. Impressed by their speed, Sonic consumes a Monster Cell for power but suffers a stomach ache as a consequence.

Meanwhile, the Hero Association deploys heroes to W-City to confront Marshall Gorilla. Zombieman tracks the monster and witnesses its fight against Armored Gorilla, who effortlessly defeats it. Zombieman shifts focus to monitor Armored Gorilla.

Elsewhere, Bang pledges to personally confront Garou if necessary, while Sonic struggles with the aftermath of the Monster Cell.