Unknown

Child Emperor presses on against Evil Natural Water. Sludge Jellyfish shows up offering help, but the liquid monster drains the oil out of him instead, and that oil's low freezing point renders the boy hero's ice attacks useless. Child Emperor is startled that a mindless creature can adjust so cannily. The focus then moves to Genos, speeding toward the Monster Association Headquarters while studying the data Drive Knight passed to Sekingar. He notes that each cadre member is dangerous and that there is no room to craft proper tactics, though he allows that Saitama may have beaten them already.

Within the base, Flashy Flash and Saitama trudge in circles with no bearings. Saitama floats the idea of calling the other heroes, but Flash counters that the remaining S-Class members are capable enough, and a narrator explains the S-Class was assembled to hold heroes who consistently defeat Demon-level monsters. Meanwhile the S-Class fighters are ground down to the brink of death by Gyoro Gyoro reading their styles and matchups. Tatsumaki locates the psychic's real body and begins wrenching it out. As she does, the villain wonders which executive is free to save her and settles on Overgrown Rover, only for the dog to already be locked in battle with Bang, Bomb, and Fubuki.

In the Tonari serialization this ran as two installments, Unknown and Real Form, which Volume 26 combined into one chapter titled Unknown; it carries Tonari numbers 165 and 166. Death Gatling, Chain'n'toad, Red Muffler, and Smile Man appear on the cover, and the bonus page reproduces the online Real Form cover with Saitama and Genos. Part one released on November 29, 2019 and part two on December 14, 2019.