Genos vs. Speed-o'-Sound Sonic

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

Prelude
Genos is with Saitama at their apartment, when he felt someone coming towards them. While checking out outside, he revealed Speed-o'-Sound Sonic. Sonic claims to be Saitama's rival and want to fight him, not wanting to disturb his master, Genos challenges Sonic himself.

Battle
They begin their battle and are shown to be on equal footing with Sonic being too fast for Genos, but he too durable from his attacks. As Genos tries to attack Sonic, the impact accidentally caught Fubuki in her fight with Saitama. Genos apologizes to Saitama for the damage and recognizes Fubuki, misinterpreted her position as a failed attempt of taking down Saitama, when Sonic attacks Genos with his Exploding Shurikens, which were ineffective.

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

Aftermath
Saitama intervened into the fight, scolding Genos for not having any reason to fight Sonic. Saitama decided to fight Sonic seriously, to which Sonic declares he will show his newly developed technique.