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Beast King (獣王 Jūō) was an artificial mutant created by Dr. Genus of the House of Evolution. He was the leader of Dr. Genus' strike force and was the second-strongest creation of the House of Evolution, exceeded only by Carnage Kabuto. He was killed by Saitama.[2]


Beast King was a large, very muscular humanoid lion with a full mane and tail. His humanoid, five-digit hands had sharp claws and padded four-toed feet.

He wore a black shirt, animal furs on his shoulders, and a leopard-skin cloth around his waist, secured by heavy chains and a belt with a lion-head buckle. There were bracelets on both his wrists and ankles and bracers on both biceps, which he breaks and shatters once enraged.


Beast King spoke very loudly, roaring, and shouting constantly. Beast King was confident in his power and became increasingly frustrated with Saitama's inexplicable strength and lack of fear.

Beast King had little regard for his fellow mutants, dismissing his killings of Slugerous and Frog Man as the "law of the jungle."[3]

In the anime, Beast king also shows a level of patience, as when Saitama was cleaning out his belt, he calmly waited until Saitama cleaned out his belt to fight.


Introduction Saga[]

House of Evolution Arc[]

After witnessing Saitama instantly kill Mosquito Girl, Dr. Genus takes great interest in him as a human specimen, and sends Beast King, Armored Gorilla, Kamakyuri, Ground Dragon, Frog Man, and Slugerous to abduct him for further research.[4]

Beast King is killed by Saitama

Saitama defeats Kamakyuri, Frog Man, and Slugerous in a failed ambush, but is grabbed and rooted in concrete by Ground Dragon. While Armored Gorilla repels Genos, Beast King taunts Saitama, threatening to scratch out his eyes. Unfazed, Saitama casually frees himself, sending Beast King into a limb-cutting frenzy.[5] He then accidentally kills Slugerous and Frog Man while trying to attack Saitama, but even after augmenting his strength, he is disemboweled by a flurry of punches from the bald hero.[6]

Beast King's death prompts Ground Dragon to flee and shatters Armored Gorilla's confidence, thus causing him to bargain with Genos and Saitama for his life.[7]

Sometime after his death, a flock of birds descends to pick at his entrails, causing them to sprout arms and become ravenous.[8]

Abilities and Powers[]

As a Demon-level threat, Beast King was a powerful creature. Despite not harming Saitama, Beast King demonstrated immense strength, chiefly through murdering his teammates and inflicting massive collateral damage to the surrounding city block. He was also called the second strongest member of the House of Evolution by Armored Gorilla, who stated that Beast King could easily destroy Genos.[9]

Physical Abilities[]

Beast King slices through a house with a single slash

Immense Strength: Beast King possessed an incredible amount of strength as he was able to easily cut through buildings with his claws, as well as with just the shock waves created from his slashes.

Immense Speed and Reflexes: Beast King was fast enough to perform multiple slashes within a short period of time.

Transformation: When enraged, Beast King gained considerable muscle mass, tearing through his clothing and ornaments. In this state, he lost all self-restraint, ignoring Dr. Genus' orders and harming his own allies.[10]

Fighting Style[]

Beast King attacks Saitama with Lion Slash: Meteor Shower

Hand-to-Hand Combatant: Beast King mainly relied on his claws, physical strength, and speed during combat.

  • Lion Slash (獅子斬, Shishi Zan): A powerful flying slash with his claws, which was capable of cutting through stone and flesh across considerable distances, demolishing entire buildings in a single swipe.[11]
  • Lion Slash: Meteor Shower (獅子斬流勢群, Shishi Zan Ryūsei-gun; Viz: Lion Slash: Meteor Power Shower): Beast King unleashes a flurry of slashes.[12]

Major Battles[]

Participants Chapter(s) Episode(s) Result
Beast King vs. Saitama 8 2 Beast King is killed.



  1. 1.0 1.1 1.2 One-Punch Man Encyclopedia; One-Punch Man: Hero Encyclopedia, page 116-117
  2. One-Punch Man Manga and Anime; Chapter 8, and Episode 2
  3. One-Punch Man Manga and Anime; Chapter 7, page 16, and Episode 2
  4. One-Punch Man Manga and Anime; Chapter 7, page 8, and Episode 2
  5. One-Punch Man Manga and Anime; Chapter 8, page 13, and Episode 2
  6. One-Punch Man Manga and Anime; Chapter 7, page 16, and Episode 2
  7. One-Punch Man Manga and Anime; Chapter 8, page 23, and Episode 2
  8. One-Punch Man Manga and Anime; Chapter 18, page 22, and Episode 2
  9. One-Punch Man Manga and Anime; Chapter 8, page 21, and Episode 2
  10. One-Punch Man Manga and Anime; Chapter 8, page 16, and Episode 2
  11. One-Punch Man Manga and Anime; Chapter 8, page 15, and Episode 2
  12. One-Punch Man Manga and Anime; Chapter 8, page 17, and Episode 2

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