Saitama destroys Jupiter with a sneeze and learns a time-manipulating ultimate attack. Throughout the One Punch Man series ... due to holding and protecting Genos' core in one of his hands ...

Saitama and Genos then enroll in the National Superhero ... Ultimately, Saitama uses his trump card, Serious Punch, defeating Boros but acknowledging him as a powerful opponent.

Saitama, aka One-Punch Man, the most powerful hero in anime. Season 1, Episode 7, "The Ultimate Disciple" focuses a little more on Genos, the naive and brave young man who was hurt in a monster ...

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 ...