Sludge Jellyfish (ヘドロクラゲ, Hedoro Kurage; Viz: Hedro-Jellyfish) is a member of the Monster Association and an ally to Phoenix Man. It is one of the Mysterious Beings who assaulted S-City alongside Elder Centipede.


One of its most notable features is, that Sludge Jellyfish looks like a walking blob with two eyes. It has goop like skin and filaments. Because its appearance, it leaves a trail like a snail.


Sludge Jellyfish is one of the more friendly monsters to appear, alongside Phoenix Man. It even tried to invite Garou to join the Monster Association despite the latter attempting to kill it. However, Sludge Jellyfish did not forget the slight and got revenge by holding Tareo hostage to mess with Garou.


Human Monster SagaEdit

Monster Raid ArcEdit

Sludge Jellyfish is first seen in S-City accompanied by Phoenix Man and Rhino Wrestler. The three monsters corner Mohican and Pineapple, who are carrying Narinki and his son Waganma.[1] Sludge Jellyfish is first seen watching the battle between Garou and Metal Bat alongside Phoenix Man.[2] After the fight was finished, it tried to kidnap Zenko, only to be intercepted by Garou and brutally smashed by him for watching over him.[3]

However, thanks to its regenerative abilities, Sludge Jellyfish survived Garou's attack. It got angry, but still tried to invite Garou to join the Monster Association. Unfortunately, the invitation rudely turned down. Sludge Jellyfish then leaves alongside Phoenix Man.[4]

Sludge Capture

Sludge Jellyfish captures Tareo.

He later surfaces again during Garou's fight with Bug God and Royal Ripper in which he captures Tareo to mess with Garou for attacking Sludge Jellyfish earlier. His action causes Garou to be distracted long enough for Bug God and Royal Ripper to deal multiple fatal blows towards him, making Garou seemingly appear dead. Afterward, he, Royal Ripper and Bug God carry Tareo back as the Monster Association HQ as hostage.

Abilities and PowersEdit

Not much is known about Sludge Jellyfish's strength, except that it's one of the few known monsters with regenerative abilities.

Physical AbilitiesEdit

Regeneration: Sludge Jellyfish possesses great regeneration. It was able to regenerate back from a pile of goo after being brutally smashed by Garou.


  1. One-Punch Man Manga; Chapter 58, page 11-13
  2. One-Punch Man Manga; Chapter 58, page 48
  3. One-Punch Man Manga; Chapter 59, page 4-6
  4. One-Punch Man Manga; Chapter 59, page 7-9