|Spring Mustachio and Golden Ball vs. Kombu Infinity|
|Outcome||Kombu Infinity is victorious|
|Heroes||Monster Kombu Infinity|
|Spring Mustachio and Golden Ball are heavily injured||Kombu Infinity is uninjured|
|Previous||Saitama vs. Speed-o'-Sound Sonic: Round Two|
|Next||Genos, Bofoi and Saitama vs. Meteor|
After hearing rumors about a potential monster disaster, the Hero Association sends Golden Ball and Spring Mustachio to investigate Z-City. Kombu Infinity also hears these rumors and decides to check it out.
Golden Ball sees Kombu Infinity and attacks it with one of his special bullets, but it is deflected. Golden Ball is then grabbed by one of Kombu Infinity's tentacles and smashed into a wall defeating him. Spring Mustachio is then attacked by Kombu Infinity's tentacles, but manages to deflect them. He then counter attacks with his Tomboy attack, but only manages to penetrate a single Kombu tentacle. Realizing that he couldn't beat Kombu Infinity on his own he calls for reinforcements. The scene then fast-forwards to a wounded Spring Mustachio collapsing and Kombu Infinity remaining uninjured.
After the fight, Kombu Infinity spotted Saitama and tried to attack him. While what exactly happened during their fight is unknown, Saitama punched a hole in a building and stole all of Kombu Infinity's hair to make Kombu soup.