Chaos Bug
Home world: Planet Earth (Cosmos Universe)
First appearance: Ultraman Cosmos Episode 5: "Revenge of the Fireflies"
Latest appearance: None
Height: 53 m
Weight: 57 000 t
Category: Kaiju
Affiliation: None
Roar(s): TBA

Chaos Bug (カオスバグ Kaosu Bagu) was a kaiju that appeared in Ultraman Cosmos episode 5, "Revenge of the Fireflies".


Ultraman Cosmos

One night Chaos Organism encountered a swarm of fireflies and turned them into ravenous killers. The swarm quickly fed on one man's car leaving only the tires.Musashi and Keisuke arrived the next day to the site only to find the chaos mutated fireflies attacking them. They were about to be eaten alive in their car when Musashi shut off the engine, making it invisible to the swarm. Shortly after the two of them went out to track the swarm, Koji and Ayano were sent in one of the fighters to assist them. The swarm took notice of the fighter's heated engine and formed into the monster Chaos Bug after being fired at. As Chaos Bug tore through the the local town, EYES tried to defeat the creature to no avail. Having no other choice, Musashi turned into Ultraman Cosmos to do battle. Even though Cosmos was able to easily out manuver it, Chaos Bug caught the hero by surprise when it's chaos absorber redirected the Cosmos Palm Beam with great force. Cosmos quickly went from Luna to Corona Mode and started to beat Chaos Bug mercilessly. After assaulting Chaos Bug Cosmos used the Naybuster Ray to blow the kaiju to pieces.


Chaos Bug BackHead

The back of chaos bug's head

  • The back of Chaos Bug's head was shaped like a skull.
  • Chaos Bug's suit was modified to make Banpira.
  • Suit actor: Toshio Miyake.
  • This episode was featured in episode 146 of New Ultraman Retsuden, "Type Change Hero! Tiga and the Warriors of Light".


Swarm form
Swarm Chaos Bug

The original appearence of Chaos Bug, it appeared as it was a swarm of firefly but in truth, they were just components (e.g. screw) that were lightened and sentient.

Powers and Abilities

  • Technology Consumption: A swarm of these can attached themselves to any light and heat source from any technology (mainly vehicles) and consume them, leaving behind tires.
  • Energy Absorption: These swarms can absorb energies or laser shots.
  • Combine: These swarm can combine themselves into the gigantic Chaos Bug.

Monster form
Ultrmn Csms Chs Bg


  • Height: 53 m
  • Weight: 57,000 t

Powers and Weapons

  • Antennae Energy Beams: Chaos Bug can fire blue energy beams from it's antennae that can cause small explosions.
  • Entrapper Stream: Chaos Bug can emit a blue stream of energy from it's left hand that can entrap small objects.
  • Chaos Absorber: Chaos Bug can absorb beams like Ultraman Cosmos's Luna Extract and redirect it through his eyes using large amounts of chaos energy in it's abdomen.
    • Luna Extract: Using this abilities, Chaos Bug can fire Ultraman Cosmos's Luna Extract through his eyes. However, this is more of a damaging move than a calming move.


Ultraman Cosmos Kaiju & Seijin
Ultraman Cosmos: The First Contact Basical Baltan | Don Ron | Clevergon | Alien Baltan (Basical, Shirubyi)
Ultraman Cosmos Chaos Header | Lidorias | Chaos Lidorias | Golmede | Chaos Golmede | Spittle | Igomas | Chaos Bug | Mogrudon | Mienin | Gamoran | Small Inculas | Inculas | Yamawarawa | Geshot | Mudon | Ephemera | Waroga | Galbas | Jelga | Jirak | Chaos Jirak | Gigi | Renki | Alien Migelon | Angrilla | Bolgils | Parastan | Chaos Parastan | Chaos Parastan S | Gelworm M | Gelworm P | Imitation Ultraman Cosmos | Gragas | Alien Srayu | Guinje | Chaos Header Iblis | Zaranga | Baby Zaranga | Eligal | Chaos Eligal | Chaos Header Mebut | Clevergon | Chaos Clevergon | Golmede Beta | Neldorand | Chaos Neldorand | Reycura | Ragstone | Mahagenom | Taildas | Chaos Taildas | Alien Beryl | Hellzking | Neldorand II | Chaos Neldorand II | Puratea | Exter Raider | Sydevakter | Delgoran | Chaos Delgoran | Sol | Taildas Mechalator | Alien Nowar | Neldorand Mechalator | Gigi Dr. XX01 | Mugera | Alien Kyulia | GiriBanes | Waroga II | Alukela | Snowstar | Vadata | Mazalgas | Chaos Mazalgas | Sangelu | Alien Carpcis | Arados | Ragstone Mechalator | Tablis | Mitoru | Gamoran II | Kawanoji | Gruanfan | Giragas | Hellzking Revised | Dolba | Chaos Dolba | Eligal II | Chaos Eligal II | Chaos Darkness
Ultraman Cosmos 2: The Blue Planet Parastan | Scorpiss | Sandros | Reija | Alien Gyashi | Shirubyi
Ultraman Cosmos vs. Ultraman Justice: The Final Battle Gloker Pawn | Gloker Mother | Mienin | Lidorias | Golmede | Don Ron | Bolgils | Gloker Rook | Gloker Bishop | Alien Gyashi | Shirubyi | Giga Endra | Delaxion