Episode 10

Unparalleled Peril (かつてない程の危機, Katsute nai Hodo no Kiki) is the tenth episode of the OnePunch-Man anime series.

Summary
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, who were called there by Bang to learn some moves, about how his former best student, Garou, went wild and defeated all of his other top students. Suddenly, a Hero Association 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 Blackluster, Pig God, Drive Knight, Zombieman, King, Child Emperor). Sitch, a member of the associations, 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 Melzalgald, a member of the Dark Matter Thieves. An alien spacecraft then proceeds to destroy A-City, causing a large number of casualties. Just as Melzalgald 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, Melzalgald proves to be a challenge for Iaian and causes him to lose his left arm before Atomic Samurai intervenes, saving his student from death. Melzalgald, however, regenerates and the heroes' attacks seem to cause no damage to him. Then, Metal Bat, Bang and Puri Puri Prisoner arrives. Puri Puri Prisoner enters Dark Angel form and unleashes punches onto Melzalgald. 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 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, Lord Boros is seen on his throne.

Characters in order of appearance

 * 1) Ancient King
 * 2) Tatsumaki
 * 3) Bang
 * 4) Genos
 * 5) Saitama
 * 6) Charanko
 * 7) Atomic Samurai
 * 8) Puri-Puri-Prisoner
 * 9) Metal Bat
 * 10) Tanktop Master
 * 11) Lightspeed Flash
 * 12) Watchdog-man
 * 13) Superalloy Darkshine
 * 14) Pig God
 * 15) Engine Knight
 * 16) Zombieman
 * 17) King
 * 18) Child Emperor
 * 19) Shicchi
 * 20) Sky King
 * 21) Eagle
 * 22) Hawk
 * 23) Falcon
 * 24) Kite
 * 25) Melzalgald
 * 26) Iaian
 * 27) Groribas
 * 28) Lord Boros