Based on the webcomic chapters, this new form was called 'Lightning ... Previously in One Punch Man, we saw Genos struggle against a demon threat-level monster, Deep Sea King.

Season 3 of One Punch Man may showcase Genos gaining a significant upgrade to face the Monster Association. Genos' pattern of upgrades always failing may be foreshadowing his eventual success.

Genos launches powerful attacks at the monster in tandem with Bang and Blast ... revealing a more compact true form. At the cost of being half-destroyed, Genos is able to defeat the villain ...

This fight has reached its climax, and with it the heroes are starting to struggle against the next wave of monster threats ... him to a powerful new form, Genos was on the verge of total self ...

This changes with Chapter 131 of the series as Genos joins the fight against Psykos when Tatsumaki is at the end of her ropes. Tatsumaki had been fighting the psychic user throughout the arc thus ...