Chapter 122 (Online)

"Unknown" (未知, Michi, Tonari: 164) is the 122nd chapter of the One-Punch Man manga series.

Summary
Child Emperor continues fighting Evil Natural Water. Sludge Jellyfish enters the room and offers to assist Evil Natural Water, but the monster sucks the oil out of him instead. This renders Child Emperor's freezing attack ineffective due to the oil's low freezing point. The hero is astonished by the brainless monster's ability to optimize the situation.

Elsewhere in the Monster Association base, Flashy Flash and Saitama run in circles, neither having any sense of direction. Saitama suggests contacting the other heroes, but Flashy Flash comments that the other S-Class heroes are competent. A narrator explains that the S-Class was created to group together heroes that were consistently capable of defeating monsters with disaster level "Demon".