The Rhedosaurus in the film was one of the last surviving members of its species, awakened by a nuclear weapons 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 plague, which was almost as deadly as the reptile itself. The Rhedosaurus was eventually killed at Coney Island when a radioactive isotope was shot into a wound on its neck, both fatally wounding it and also neutralizing the disease. As the Rhedosaurus succumbed to the isotope, a fire it started by destroying the machinery of a roller coaster spread across the island. The Rhedosaurus burst free of the burning coaster and roared out defiantly before finally collapsing to the ground, dead.
The Rhedosaurus' blood contains a deadly germ that can enter the bodies of other organisms which cause severe sickness and eventually death.
- The Rhedosaurus, along with King Kong, was one of the main inspirations for Godzilla.
- Originally, Rhedosaurus was planned to breath atomic flame from the mouth and this can be seen on earlier posters although this was scrapped due to budgetary problems.
- Stephen Czerkas constructed a stop-motion Rhedosaurus model for the 1977 film Planet of Dinosaurs, where it battles and is killed by a Tyrannosaurus Rex. According to animator Jim Aupperle, "Stephen and I both place the Rhedosaurus among our top favourite of Ray's myriad monsters. We felt that by giving the great Beast a cameo in our film we were acknowledging the immense debt we both feel to Ray. We had to make the Rhedosaurus more of a baby size because one as large as the original would have made a meal of our Tyrannosaurus instead of the other way around."
- A creature resembling the Rhedosaurus briefly appeared in the 1970 film When Dinosaurs Ruled the Earth, though whether it is meant to be an homage to the Rhedosaurus is unclear.
- The Rhedosaurus appeared in the 6th episode of the 2nd season of ABC's Whose Line Is It Anyway?.
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