Some early pre-production conceptual sketches of the Beast showed that, at one point, it was to have a shelled head and later was to have a beak. Creature effects were assigned to Ray Harryhausen, who had been working for years with Willis O'Brien, the man who created "King Kong". The film monster looks nothing like the Brontosaurus-type creature of the short story. It is instead a kind of Tyrannosaurus rex-type prehistoric predator, though quadrupedal in stature. The monster was unlike any real carnivorous dinosaur and more closely resembled a rauisuchian. A drawing of the creature was published along with the story in "The Saturday Evening Post". At one point, there were plans to have the Beast snort flames, but this idea was dropped before production began due to budget restrictions. The concept, however, was used for the film poster. Later, the creature's nuclear flame breath was the inspiration for the original Japanese film "Gojira" (1954, "Godzilla").