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Image gallery for Cryptocledius

Alternate names Cryptocleidus, Cryptcledius
Species Giant Plesiosaur
Controlled by Leviathan Aliens
Enemies Godzilla
Created by Fil Barlow
First appearance "Leviathan"

Cryptocledius (クリプトクレディアス,   Kuriputokurediasu) is a plesiosaur kaiju created by TriStar Pictures that first appeared in the 1998 Godzilla: The Series episode, Leviathan.


Cryptocledius were aquatic long-necked reptiles, or plesiosaurs, that went extinct at the end of the Cretaceous period, in 65,000,000 B.C. However, it seems a number of the Cryptocledius somehow survived extinction.


Godzilla: The Series


After surviving the extinction of the other Cretaceous reptiles, at least two Cryptocledius lived deep in an ocean trench, and lived undisturbed until the discovery of the Leviathan spaceship brought scientists from the Humanitarian Environmental Analysis Team down to their level. One of the Cryptocledi attacked their vessel, but Godzilla came to defend them. Godzilla was able to fight off the Cryptocledius, but not for long.

When H.E.A.T. left the sunken ship in an escape pod, the two Cryptocledi converged on the pod, and were once again challenged by Godzilla. They worked together to try and defeat him, but ultimately, the Cryptocledi were both subdued with a rock slide.

"Monster Wars: Part 2"

A Cryptocledius was sent by Leviathan Aliens from Site Omega, on the Isle Del Diablo to eliminate H.E.A.T., who were approaching the island and battling the Giant Bat. Their battle raged on, and H.E.A.T. was able to emit a reverse frequency of the Bat's echolocation frequency in order to blind it. They then sent out a radar pulse to turn the bat on the Cryptocledius, which worked, allowing them to escape, but the Leviathan Aliens stopped the fight and called the monsters back to Site Omega. As they approached, H.E.A.T. abandoned ship in order to ride to Site Omega on the back of the unwitting Cryptocledius. All Monsters were then sent into the world's major cities to cause destruction. Cryptocleidus was sent to Hong Kong.

"Monster Wars: Part 3"

Cryptocledius continued its rampage until H.E.A.T. deactivated the Leviathan Alien control beacon. At that point it began to attack Leviathan Alien vessels until it was incapacitated by human forces.


Sonic vocalizations

Video games

Godzilla: The Series - Monster Wars

A Cryptocledius was making its way toward the source of a tachyon pulse emission in the Pacific Ocean by way of waters in or near New Jersey in the United States. It came face to face with Godzilla heading the opposite direction. The Cryptocledius attacked with sonic vocalizations, but was ultimately incapacitated by the irradiated reptile.


Main article: Cryptocledius/Gallery.

In other languages

Language Name Meaning
Flagicon Japan.png Japanese クリプトクレディアス[1] Kuriputokurediasu Transliteration of English name
Flagicon Russia.png Russian Криптоклид Kriptoklid Cryptoclid


This is a list of references for Cryptocledius. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: [1]


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Godzilla: The Series