Deep Sea King

A fish-man monster who invades City J during a downpour and grows stronger the wetter he gets. He tears through a string of heroes, humiliating the S-Class and nearly killing Genos, before a C-Class rider's hopeless charge and Saitama's arrival finish him. He is the season's best showcase of how heroism, not power, is what counts.

Deep Sea King is a humanoid sea creature with blue-green skin, a muscular frame, webbed hands, gill-like markings, and a fin-shaped crest. His pointed ears and sharp teeth give his face an unmistakably aquatic look, while his bright eyes and minimal clothing emphasize his imposing physique. When rain reaches him during the battle, his body swells and becomes more heavily muscled, with a more fearsome face and larger teeth. The transformation makes him look less like a lean amphibious fighter and more like a hulking, brutal monster.

Deep Sea King is arrogant, cruel, and convinced that the Seafolk are entitled to rule the surface. He regards humans as weak intruders and treats their fear as proof of their inferiority. In combat, he enjoys overpowering opponents and is quick to mock those who cannot match his strength. He is also pragmatic enough to exploit circumstances, including the rain that restores and enhances his body. His confidence can shade into carelessness: he underestimates the resolve of heroes who keep standing after defeat and assumes that physical dominance settles every contest. He shows no concern for civilians caught in his invasion.

Before appearing in the city, Deep Sea King is established as the ruler and champion of the Seafolk, an underwater people who rise to invade the surface. Their assault is presented as an effort to claim territory from humanity, whom their king considers unworthy of the land. The series offers little personal history about his life before the invasion, and does not explain how he gained his position or how the Seafolk society is organized. His role is defined chiefly by his authority over the attackers, his confidence in their mission, and his belief that the surface world will fall to their physical superiority.

1. Seafolk Invasion

   Deep Sea King leads the Seafolk attack on the city, arriving as the central threat after the earlier assailants have been dealt with. He confronts people sheltering from the rain and demonstrates that the invasion is not a negotiation or a limited raid. His presence turns a public shelter into a place of danger and draws the attention of the heroes stationed in the area.

2. Shelter Assault

   At the shelter, Deep Sea King attacks civilians and defeats the heroes who try to stop him. Puri-Puri Prisoner and Genos both engage him, but neither can end the assault. Genos is badly damaged while protecting a child, and Deep Sea King continues to use the heroes' setbacks to intimidate the people around them.

3. Hero Association Response

   The attacks expose how difficult it is for the responding heroes to protect civilians from a powerful, fast-moving enemy. Mumen Rider arrives despite being badly outmatched and attempts to delay the king. Deep Sea King knocks him down, but the hero's refusal to retreat gives the crowd a reason to resist despair.

4. Saitama's Intervention

   Saitama arrives after the other heroes have been overwhelmed and quickly takes control of the fight. Deep Sea King tries to use his increased power in the rain, but Saitama's strength proves far greater. The king's defeat ends the Seafolk assault and leaves the public reaction to the heroes as a further consequence of the incident.

Saitama

Defeated opponent

Saitama confronts Deep Sea King after the other heroes have failed to stop the invasion. The king's confidence and rain-enhanced power do not alter the outcome: Saitama defeats him decisively, ending the immediate threat to the city.

Genos

Combatant and adversary

Genos tries to stop Deep Sea King at the shelter and is seriously damaged while protecting a child from the king's acidic attack. Their clash demonstrates both Genos's willingness to defend civilians and the Seafolk ruler's lethal advantage.

Mumen Rider

Opponent

Mumen Rider arrives to challenge Deep Sea King even though he is clearly outmatched. The king knocks him down, but Mumen Rider's intervention helps the frightened civilians retain hope and shows that courage does not depend on winning a fight.

Puri-Puri Prisoner

Opponent

Puri-Puri Prisoner is among the first heroes to confront Deep Sea King at the shelter. The king overwhelms him, establishing the scale of the danger and leaving the remaining heroes with an even more difficult task.

• He leads the Seafolk's invasion of the surface city.
• He defeats Puri-Puri Prisoner and damages Genos during the shelter fight.
• Rain transforms him into a larger and more powerful form.
• He knocks down Mumen Rider before Saitama arrives and defeats him.

• His power increases when he is exposed to rain.
• He is the leader of the Seafolk invasion force.
• His saliva is corrosive and can be used as a ranged attack.

• Vaccine Man
• Carnage Kabuto
• Dr. Genus

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

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