Genos vs. Speed-o'-Sound Sonic
Genos vs. Sonic
Arc The Blizzard Group Arc
Event Speed-o'-Sound Sonic Challenge
Location Z-City
Outcome Interrupted by Saitama
Genos Speed-o'-Sound Sonic
Abilities and Techniques
  • Hand-to-Hand Combat
  • Incinerate
  • Machine Gun Blow
Speed-o'-Sound Sonic
  • Exploding Shurikens
  • Four Shadows Burial
  • Scattered Flash Slash
Webcomic Chapter 48 - 49
Manga Chapter 41 - 43
List of Fights
Previous Garou vs. Blue Fire,
Heavy Tank Loincloth, Magic Trick Man and Criminals
Concurrent Saitama vs. Fubuki, Eyelashes and Mountain Ape
Next Saitama vs. Speed-o'-Sound Sonic: Round Three

Genos vs. Speed-o'-Sound Sonic is a fight fought between Genos and Speed-o'-Sound Sonic.


Genos is with Saitama at their apartment, when he feels someone coming towards them. While checking outside, he discovers Speed-o'-Sound Sonic. Sonic claims to be Saitama's rival and wants to fight him. Not wanting to disturb his master, Genos challenges Sonic himself.[1]


Sonic on lamp

Sonic and Genos fight

They begin their battle and are shown to be on equal footing, with Sonic being too fast for Genos, and Genos being too durable. As Genos tries to attack Sonic, the impact accidentally catches Fubuki in her fight with Saitama. Genos apologizes to Saitama for the damage and recognizes Fubuki, misinterpreting her position as a failed attempt at taking down Saitama, when Sonic attacks Genos with his Exploding Shurikens, which prove to be ineffective.[2]

Genos on the ground

Genos knocked down

Sonic declares that he shall defeat Genos and challenge Saitama to another duel, but Genos simply states he will make sure Sonic will be erased. Sonic, amused by Genos' statement, is suddenly attacked, and begins to dodge all of Genos' attacks, all the while feeling mocked, until Genos cuts off his topknot. Genos then gets behind Sonic and uses Machine Gun Blows, but is surrounded by Sonic's Four Shadows Burial. Just as Sonic is about to attack Genos with his Scattered Flash Slash, Genos decides to blast the whole area with his Incineration Cannon, but is knocked down by Saitama who didn't want his place to be destroyed.[3]


Saitama intervenes in the fight, scolding Genos for not having any reason to fight Sonic. Saitama then decides to fight Sonic seriously, to which Sonic declares he will show his newly developed technique.[4]


  1. One-Punch Man Manga; Chapter 41, page 7-11
  2. One-Punch Man Manga; Chapter 42, page 17-25
  3. One-Punch Man Manga; Chapter 43, page 2-20
  4. One-Punch Man Manga; Chapter 43, page 24-26