|Saitama vs. Speed-o'-Sound Sonic|
|Outcome||Saitama is victorious|
|Hero Saitama||Villain Speed-o'-Sound Sonic|
|Saitama is uninjured||Sonic is hit in the crotch|
|Previous||Saitama vs. Hammerhead|
|Next||Spring Mustache and Golden Ball vs. Kombu Infinity|
After defeating Hammerhead, Sonic attacks Saitama mistaking him for a Paradiser. He then tries to kill Saitama for being able to keep up with his speed. He showcases his speed and tries to attack Saitama with his Wind Blade Kick, but is accidentally hit in the crotch by Saitama, ending their fight.
While writhing in pain, Sonic declares Saitama his rival and declares he will one day kill Saitama.