Spectreman Wiki
Subtitle Sludge Monster (ヘドロ怪獣 Hedoro Kaijū)
Aliases None
Status Deceased
Gender Unknown
Species Pollution Kaiju
Physical Information
Forms None
Height ?
Length ?
Weight ?
Eye color Yellow (true colors), red
Relationships and Affiliations
Controlled by Dr. Gori
Allies Dr. Gori
Enemies Spectreman
Other Information
First appearance Spectreman episode 1, "The Uncommon Enemy"
Latest appearance Spectreman episode 2, "Hedoron Lives!"

Hedoron (ヘドロン,   Hedoron?) is a kaiju that first appears in "The Uncommon Enemy", the first episode of Spectreman. It was created by Dr. Gori and became Spectreman's first opponent in the series.



  • Corrosive Mist: From the tips of its tentacles and its mouth, Hedoron can emit a corrosive yellow mist that can melt human flesh and corrode structures to the point of collapsing.
  • Tentacles: Hedoron is armed with numerous, constricting tentacles surrounding its head.


"The Uncommon Enemy" (Episode 1)[]

Arriving on Earth, Dr. Gori discovered the planet was suitable for invasion. However, humanity was running amok with its pollution. With the planet threatened by the vast toxins in the oceans and smog in the air, he molded a creature from the garbage overflowing in Tokyo. The result was Hedoron, a toxic monster of filth. After it demolished an oil refinery, Spectreman’s overlords allowed the mortal to transform into the robotic warrior. Unfortunately, the hero did not go unnoticed. While flying around the colossal creature, he was hit by a ray of energy from Dr. Gori’s saucer. The titan was shot down, grazing the pollution monster with the flames covering his body.

"Hedoron Lives!" (Episode 2)[]

With the toxic thing injured, Dr. Gori recalled it and made it a new. Unleashed not long after, the monster began to ravage Japan again. Granted permission to transform again, Spectreman challenged the bizarre thing for a second time. With a combination of his Spectre-Flash and flying directly through the living mountain of sludge, Spectreman destroyed the beast with ease.


  • Hedoron roar is a modified roar of the Toho Monster, Kamacuras.
  • Hedoron's name is very similar to the Toho monster, Hedorah. This is interesting, as both are pollution-based monsters.

Spectreman Kaiju and Aliens
HedoronBakulahDeceitmanDust ManGilagindGokinosaurusKuruma-NikurasBaronsaurusMagulahMidoronMitsu Kubi RyuMogunetudonMogzNeo HedoronNezubirdonSalamandarSatan KingSilver RoboSpincobraThunder GeiZariganidZeronVegaronSphinxSphinx-Beast