Hedorah was named for hedoro, the Japanese word for mud.
In its first form, it resembled a tadpole. In its second form, it resembled a quadrupedal reptile. Its third form was like a flying saucer, and its final form took on a humanoid shape.
Thankfully, Godzilla quickly came to the rescue again, using his ray to re-energize the electrodes. Badly dehydrated by their electricity, Hedorah tried to escape, but thanks to Godzilla's new-found power of flight, was returned to the electrodes and was dried out completely. Sensing that there was still wet sludge within Hedorah's dried out husk, Godzilla proceeded to rip out Hedorah's innards, then used the electrodes to fry them. Godzilla had finally killed Hedorah, but not without a price; he had lost one of his eyes, and his right hand was burnt down to the bone. At the end of the movie, a picture of another Hedorah is seen in some water, with the caption 'And yet another one?', but no sequel to the film was produced.
The Hedorah in Godzilla vs. Hedorah killed thousands of people. Hedorah killed some of the oil tankers' crew mates, most of the swimmers and fish in the sea, about 40 people on the first time he went on land, 1600 people when it was first flying, an unknown number when he was flying to Mount Fuji and about 80 of the people who were partying on Mt. Fuji. Also, over 3,000,000 people were affected by Hedorah's smog. Strangely enough, it is not shown in the Millennium series whether Hedorah kills any people at all.Godzilla Island.
There was also another Hedorah in Godzilla Island called Neo Hedorah.Godzilla: Final Wars. Hedorah, along with Ebirah, is seen being blasted out of Tokyo Harbor by Godzilla and crashing into a building, with Ebirah's claw piercing Hedorah's left eye. The two are then destroyed by a blast of Godzilla's atomic ray. It is unknown if Hedorah had been involved in the Xiliens' invasion, or if he was simply in the wrong place at the wrong time. During the end credits a few deleted scenes were shown, one of which was Hedorah using his sulfuric acid mist emitted from his tube.
Hedorah is one of the strongest opponents Godzilla faced in the Showa series (though Godzilla easily defeated Hedorah in Final Wars, which means that either the Millennium Hedorah is much weaker than the Showa, or that the Final Wars Godzilla is far more powerful than the Showa one). Hedorah possessed many special abilities. Hedorah's primary form of attack was by squirting chunks of its own acidic body at its opponent, as well as a red laser beam from its eye. In its saucer form, it was also able to fly, and spread a mist of sulfuric acid as it went along, and in its final form it could revert back to its flying form at will. It could also trap enemies by throwing them down and spewing mud on them. Hedorah can reproduce asexually, can combine with and separate from other species, and does not need oxygen to survive.
Hedorah has strong defenses, as it was completely immune to Godzilla's atomic breath even in its comparatively weak second stage, and conventional weapons would merely pass straight through its disgusting body. Tearing into Hedorah's body proved to be ineffective as well, and it resulted in the flesh on Godzilla's paw dissolving all the way down to the bone, as Hedorah's blood alone is very toxic. Only his eyes are known to be affected by his own liquid sludge. In the ending credits of Godzilla: Final Wars, Hedorah is shown spraying sulfuric acid mist from tubes on his body, while stomping through city ruins. In Final Wars, Hedorah was also given a whip-like arm, which he may or may not use in battle.
Hedorah appears as a villain in the 1988 Nintendo game Godzilla Monster of Monsters, as well as the sequel, Godzilla 2: War of the Monsters. Hedorah was an enemy in Gojira-Kun and the Godzilla Gameboy game as well, and was unique because Godzilla's blows couldn't hurt him, but rather push him back somewhat.
Hedorah also makes an appearance in Godzilla: Destroy All Monsters Melee, where it randomly appears in disc form and slows the energy recovery. It can be killed, though this is difficult. When it is killed, it turns into a puff of smoke which dies away.
Hedorah was stated to appear in both of the Godzilla: Destroy All Monsters Melee sequels but for Godzilla: Save the Earth, the game's engine couldn't develop a skeleton for Hedorah since it is a gelatinous blob, and for Godzilla: Unleashed, the cel-shading was a long and complicated process so Pipeworks decided to scrap him. Since Battra's appearance in the PlayStation 2 version of Godzilla: Unleashed, Hedorah has become the most wanted playable monster for a video game.
ComicsGodzilla: Rulers of Earth, as part of Dr. Kenji Ando's conference about the reasons why kaiju have gained their own place in the natural order. In the presentation, it's learned that the "Smog Monster," as the news like to call Hedorah, attacked several oil rigs in the ocean.
Hedorah's gurgling roar comes from Kemular, a poison gas monster the original Ultraman series.
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