The Leviathan Aliens were a species of six-limbed, telepathic extraterrestrials that landed on Earth sixty-five million years ago, around the extinction of the dinosaurs. They stayed alive long enough to breed the Reptilians and Cryptocledius before going dormant. In the present day, they were awakened when a team of scientists, Dr. Alexander Preloran and his assistants Dr. Hans Sopler and Dr. Ted Hoffman, found their ship, the Leviathan, stuck at the bottom of the ocean. While investigating, however, they discovered that the alien crew was still alive.
Soon afterwards, H.E.A.T. encountered a transmission coming from the aliens, and tracked the source to the Hazard Abyss. They furthermore discovered that the team of scientists never returned from their expedition, and so investigated the situation. When they docked with the Leviathan, they found the crew alive, and that they had taken Dr. Preloran as their mental captive. Having used their telepathic abilities to absorb the scientists' knowledge, the aliens decided to colonize Earth. After Nick Tatopoulos blew up the Leviathan's controls, Preloran broke free of the Leviathan Aliens' control, and sacrificed himself to let the others escape. The ship then exploded, killing all on it.
The Leviathan Aliens had actually downloaded their minds into Preloran's two assistants, Drs. Sopler and Hoffman, who gradually mutated into the forms of the Leviathan Aliens. The two used their new psychic abilities to keep H.E.A.T. divided and the U.S. military on their side, and then use the military's technology to resurrect the original Godzilla as a cyborg called Cyber Godzilla. The cyborg attacked Nick and H.E.A.T., but when Godzilla came to the rescue, he was torn between his biological parent, Cyber Godzilla, and his adoptive father, Nick. The Leviathan Aliens used this confusion to take control of Godzilla, and unleashed him and the other mutations on Earth they had taken control of to attack major cities. This way, human military forces would be weakened enough to be unable to resist the approaching Leviathan Alien fleet. However, Dr. Mendel Craven managed to scramble the signal that was controlling the monsters, allowing them to turn against the aliens and destroy enough of the Leviathan Alien craft to force a retreat. Godzilla then turned against his biological parent and battled Cyber Godzilla, eventually tearing off his arm and chestplate and destroying him. With the Leviathan Aliens' plans foiled, Sopler and Hoffman became free of the Leviathan Aliens' control and reverted to their human forms. The Leviathan Aliens' base of operations, Site Omega, was later converted by the U.S. military into a containment facility for Earth's monsters dubbed Monster Island.
In Other Languages
- At one point Nick Tatopoulos insultingly refers to the Leviathan Aliens as "space monkeys," a nod to the Black Hole Planet 3 Aliens, the race that constructed the original Mechagodzilla, upon which Cyber Godzilla is based.
- The Leviathan Aliens' plan is similar to that of the Kilaaks from the film Destroy All Monsters, which involves taking control of all Earth's monsters and sending them to attack major cities.
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