Lord Boros

The pirate captain of the Dark Matter Thieves, a one-eyed alien conqueror who has spent decades crossing the galaxy looking for a fight worth having. He arrives at Earth expecting a challenge and finds one in Saitama, trading blows that wreck his own ship. Proud, courteous and genuinely delighted, he is the only villain who gets what he came for.

Lord Boros is a towering alien with blue skin, a single prominent eye, sharp teeth, and a crest of pale, horn-like spikes. At first, much of his body is enclosed in heavy armor that gives him a broad, imposing silhouette. Once the armor breaks, he appears more muscular and his energy becomes visibly concentrated around him. In his most powerful state, his body changes further and is surrounded by a vivid aura. His size, unusual coloring, and single eye distinguish him from the human heroes he encounters.

Boros is a confident, formidable conqueror who has grown dissatisfied with victory coming too easily. He seeks a worthy opponent and takes the prophecy about finding one on Earth seriously enough to lead a long journey there. Unlike his crew's more dismissive attitude toward resistance, he recognizes strength when he encounters it and becomes absorbed in the challenge. He is not gentle: he orders the destruction of cities and treats planetary conquest as an ordinary undertaking. Yet his drive is more personal than simple greed. He wants the intensity of a genuine fight, and his encounter with Saitama gives him the contest he had hoped to find, even as he misjudges its outcome.

Before the events of the series, Boros travels through space as the leader of the Dark Matter Thieves, a force that conquers worlds. His long record of victories leaves him searching for an opponent capable of challenging him. A prophecy from a seer points him toward Earth, where he is told he may find the battle he wants. Boros commits to the journey despite its great length, bringing his crew and enormous spacecraft with him. The anime gives little detail about his origins or home world; it chiefly establishes his history through his status as a feared conqueror and his prolonged search for a worthy adversary.

1. Dark Matter Thieves' Arrival

   Boros's enormous spacecraft appears over the city and launches a devastating attack. As leader of the Dark Matter Thieves, he directs the invasion from within the ship, while his crew members descend to confront the heroes. The assault establishes him as the season's central alien threat and causes widespread destruction before he personally enters the fight.

2. S-Class Defense of A-City

   While Boros remains aboard his ship, the S-Class heroes battle the invaders who have been sent to stop them. The crew's commanders prove dangerous opponents, and the battle spreads across the damaged vessel. The heroes' resistance delays the assault, but does not prevent Saitama from making his way toward Boros.

3. Confrontation aboard the ship

   Boros meets Saitama inside the spacecraft and recognizes that he has found an opponent unlike the others he has faced. He removes the armor that has been restraining his power and escalates the fight through increasingly forceful attacks. Saitama withstands the assault, leaving Boros to search for still greater strength.

4. Final battle

   Boros unleashes his most powerful techniques in an attempt to defeat Saitama and fulfill his long search for a worthy fight. Even his vast energy fails to overcome Saitama, and the battle leaves Boros critically defeated. His final assessment of their encounter reveals that the fight did not meet his expectations in the way he had hoped.

Saitama

Sought-after opponent

Boros travels to Earth hoping to find a genuine challenge and ultimately faces Saitama aboard his ship. He recognizes Saitama as stronger than the opponents he has encountered before, but cannot defeat him, even after escalating to his most powerful techniques.

Melzargard

Subordinate

Melzargard serves as one of Boros's commanders and fights the S-Class heroes who defend the city. His role reflects the scale of Boros's invasion force, though the anime does not dwell on a personal bond between the two.

Geryuganshoop

Subordinate

Geryuganshoop is a powerful member of Boros's crew who confronts heroes aboard the spacecraft. As one of the invasion's senior fighters, he helps defend Boros's ship, but the series presents their connection chiefly through the chain of command.

Groribas

Subordinate

Groribas is another of Boros's powerful crew members and takes part in the assault on the heroes. His place among the ship's commanders underscores Boros's command over an organized force, rather than a group of ordinary raiders.

• He brings the Dark Matter Thieves' spacecraft to Earth and attacks A-City.
• He removes his armor to release the power it had been restraining.
• He enters Meteoric Burst during his fight with Saitama.
• He uses the Collapsing Star Roaring Cannon against Saitama.

• His journey to Earth follows a prophecy about finding a worthy opponent.
• His armor restrains his power rather than serving only as protection.
• He leads the crew known as the Dark Matter Thieves.

• Vaccine Man
• Carnage Kabuto
• Dr. Genus
• Deep Sea King

• Saitama
• Genos
• Speed-o'-Sound Sonic
• Mumen Rider
• Bang (Silver Fang)
• Tatsumaki (Tornado of Terror)
• Puri-Puri Prisoner
• King
• Mosquito Girl

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