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The Sea's Master-Beast of the Ages–raging up from the bottom of time!
They couldn't believe their eyes! They couldn't escape the terror! And neither will you!
The Rhedosaurus is the main antagonist of the 1953 black-and-white science fiction monster film The Beast from 20,000 Fathoms.
It is a 100 million-year-old, 200-foot long, 500-ton giant man-eating monster and one of the last surviving members of its species, awakened during hibernation by a nuclear test in the Arctic. It made its way down the North American coast, destroying everything in its path and ending up in New York, its original home. Attempts to kill it were complicated by an ancient disease it carried; spilling its blood freed the virus, which was almost as deadly as the reptile itself.
It served as one of the main inspirations for Godzilla alongside King Kong (who also influenced the Rhedosaurus) and is one of the most iconic movie monsters of all time along with them.
The Rhedosaurus on the surface looks little more than a lizard with large fangs, claws and spikes going from the top of its head that run down its back and end on its tail, but originally, it was supposed to be more sauropod-like, resembling the early 20th century depictions of aquatic sauropods (though still with the fangs, claws and spikes, as well as webbed feet and a crocodile-like tail), but was changed into a more unique design, since sauropods (and dinosaurs in general) were common movie monsters around this time.
At one point during its concept art stage, the Rhedosaurus was meant to have horns, but these aren't in the final design for some reason.
The world's been here for millions of years. Man's been walking upright for a comparatively short time. Mentally we're still crawling.
~ Professor Tom Nesbitt regarding the creature's age.
The Rhedosaurus is the scientific name given to a carnivorous dinosaur that was frozen in ice in the Arctic during the Ice Age, where it had been held in suspended animation for millions of years. The last surviving member of its species, it was only released from its hibernated state when it was thawed by an atomic bomb test in the Arctic Circle. Upon thawing, the Rhedosaurus made its way alongside the East Coast of North America towards its original home, where New York City is located.
During its migration, the Rhedosaurus destroys everything that stands in its path, including a fishing ketch off the Grand Banks, another ketch near Marquette, Canada, and numerous buildings in Massachusetts. In Maine, the beast attacks a lighthouse after mistaking its fog horn to be the call of another of its kind. Once it reaches Manhattan, the Rhedosaurus topples over buildings and vehicles, and eats several people such as a police officer that shoots it with his gun. Military troops led by Colonel Evans try numerous methods to stop the Rhedosaurus' rampage, but it proves too resilient. Attempts to kill it were complicated, because of the ancient disease it carried; spilling its blood that can make people sick and die with an ill feeling while the plague from its blood has freed, which was almost as deadly as a dangerous venomous creature itself. When the military shoot a bazooka into the beast's throat, the Rhedosaurus flees to the ocean, but in the process it bleeds all over the streets of New York City, unleashing a horrible, virulent prehistoric contagion, which begins to infect the populace, causing even more fatalities. Blowing up the Rhedosaurus or setting it ablaze would only spread the contagion further. The military comes up with the idea of shooting a radioactive isotope into the Rhedosaurus' neck wound in hopes that it would burn from the inside and not release more of the contagion.
The Rhedosaurus then comes back ashore and reaches Coney Island's amusement park. A military sharpshooter by the name of Corporal Stone takes a rifle loaded with a potent radioactive isotope and rides a roller coaster to the top to get eye-level with the beast. Once he reaches the top of the tracks, Stone fires the isotope into the Rhedosaurus' open neck wound. The beast thrashes about in pain, causing the roller coaster to spark when it falls to the ground, setting the whole amusement park ablaze. Letting out one last roar, the Rhedosaurus perishes from the poisoning and heat.
Powers and Abilities
This is full-scale war against a terrible enemy... such as modern man has never before faced. Ordinary bullets have no effect... and a method of destroying the awesome creature... has not yet been formulated.
~ Radio Operator
The Rhedosaurus is a massive and mighty creature, able to destroy buildings with ease and take just about anything the military throws at it. However, shooting the dinosaur with the deadliest weapons will only worsen matters due to the disease in its bloodstream. A single drop of the monster's blood can infect and hospitalize 50 nearby soldiers, touching it may cause death and since the germs in the blood can spread in the air, attacking the Rhedosaurus with flamethrowers or destroying the creature completely could lead to catastrophic events.
If a weapon manages to damage it, the Rhedosaurus possesses a healing factor capable of regenerating small wounds in a matter of hours.
FANTASTIC SEA-GIANT CRUSHES CITY!
~ The tagline for The Beast from 20,000 Fathoms.
For some reason the creation was called a Rhedosaurus, and although I can't remember where this name came from, I suspect Hal Chester or one of the writers coined it. Over the years, people have suggested that the first two letters relate to the initials of a certain animator. I have no comment.
~ Ray Harryhausen, animator of the Rhedosaurus and countless other movie monsters, on the creature's name.
The task of instilling pathos into a creature that was, after all, an innocent victim of circumstances was something I had set myself from the outset, although I was restrained by the script... The Beast is a poor lost soul brought back to life by man and then destroyed by man. If it sounds familiar, it is. King Kong was a huge influence, as he would be in all the other creatures I would be father to.
~ Ray Harryhausen on the creature's circumstances and creation.
The scene where the Rhedosaurus destroys a lighthouse was based on the 1951 short story The Fog Horn (retitled into The Beast from 20.000 Fathoms after the film was published as a tie-in) by the late Ray Bradbury.
In the few hours the Rhedosaurus' rampage took place, it killed 180 people and injured 1,500, causing so much destruction that 300 million dollars would be required to repair it all.
The Rhedosaurus makes a cameo appearance in the 6th episode of the 2nd season of ABC's Whose Line Is It Anyway?.
In The Fog Horn, the Rhedosaurus survived and return to the sea to sleep in the depths of the ocean.
The Rhedosaurus also appears in the films Planet Of Dinosaurs and When Dinosaurs Ruled the Earth. However, in these films he appears smaller in size and different in color (orange in the first film, gray-green in the second) and does not appear to have the infectious blood he had in the original film.