Saitama vs. Speed-o'-Sound Sonic
Location F-City
Chapter(s) 14, 15
Episode(s) 4
Outcome Saitama is victorious
Hero Saitama Villain Speed-o'-Sound Sonic
  • Hand-to-Hand Combat
Speed-o'-Sound Sonic
  • Ninjutsu Master
  • Wind blade Kick
  • Swordsmanship
  • Kunai
Damage Sustained/Casualties
Saitama is uninjured Sonic is hit in the crotch
Previous Saitama vs. Hammerhead
Next Spring Mustachio and Golden Ball vs. Kombu Infinity
Saitama vs Sonic (F-City) is the first battle between Saitama and the assassin Speed-o'-Sound Sonic.

Prelude Edit

Realizing that Hammerhead escaped, Sonic hunts after his trail only to encounter Saitama.

Battle Edit


After defeating Hammerhead, Sonic attacks Saitama mistaking him for a Paradiser. Due to an injured pride, Sonic tries to kill Saitama for being able to see through his attacks. He showcases his speed, boasting how Saitama can't keep up with his speed, and tries to attack Saitama with his Wind Blade Kick. Unfortunately, Sonic is accidentally hit in the crotch by Saitama, ending their fight. The battle with Speed-o'-Sound Sonic lasted 57 seconds.[1]

Aftermath Edit

While writhing in pain, Sonic declares that he will take a leave from his mercenary occupation to train and asks for Saitama's name. Sonic states that Saitama his rival and declares he will one day kill Saitama. Saitama encourages him.


  1. One-Punch Man Encyclopedia; One-Punch Man: Hero Perfection, page 129