Unparalleled Peril

Katsute nai Hodo no Kiki (かつてない程の危機)

The Ancient King of the Terror Lizard Clan appears and Tatsumaki is sent to deal with him. After a short quarrel, Tatsumaki sends a meteor from outer space to destroy the monster. At Bang's dojo, Bang tells Saitama and Genos about how his former best student, Garou, went wild and defeated all of his other top students. Suddenly, a Hero Association staff member comes and informs the heroes that an emergency has been declared and all S-Class heroes have been called to a meeting.

At the association, Saitama meets Atomic Samurai, an arrogant S-Class hero, and others (Puri-Puri Prisoner, Metal Bat, Tanktop Master, Flashy Flash, Watchdog Man, Superalloy Darkshine, Pig God, Drive Knight, Zombieman, King, Child Emperor). Sitch, a member of the association, starts the meeting by telling the heroes that the emergency would be perilous and even with their skills, there is no guarantee of survival. Also, the great seer, Madam Shibabawa, had died while becoming agitated and choking on a cough pill because of a coughing fit while predicting the future. Sitch mentions that Shibabawa's predictions have always been 100% accurate, be it monster attacks or natural disasters. Before she died, she left a note, thought to be her greatest prophecy. The note read "The Earth is in trouble", alarming the heroes. He warns the heroes to prepare for a fight in the next 6 months. Just after he says this, the HQ is attacked by Skyfolk, who are quickly slain by Melzargard, a member of the Dark Matter Thieves. An alien spacecraft then proceeds to destroy A-City, causing a large number of casualties. Just as Melzargard is about to kill some civilians, Iaian, a student of Atomic Samurai, arrives and engages him in battle. Saitama encounters the alien ship and advances towards it, avoiding some projectiles thrown at him and damaging the ship.

Meanwhile, Melzargard proves to be a challenge for Iaian and causes him to lose his left arm before Atomic Samurai intervenes, saving his student from death. Melzargard, however, regenerates and the heroes' attacks seem to cause no damage to him. Then, Metal Bat, Bang and Puri-Puri Prisoner arrive. Puri-Puri Prisoner recalls Deep Sea King's words and enters Dark Angel form and unleashes punches onto Melzargard. Elsewhere, the other S-Class heroes discuss how to bring down the ship. As they offer differing views, Genos notes that Saitama has already entered the ship and has slain a large number of the aliens. He comments that there is no evil that Saitama is unable to defeat. Saitama encounters Groribas, an alien, and manages to destroy him with one punch. Saitama continues to destroy the ship, wondering where the boss might be. At the end, Boros is seen on his throne.