Rodan, a 1956 release from Toho Studios, the company responsible for the Godzilla series. Like Godzilla, and Anguirus it is designed after a type of prehistoric reptile (The Japanese name "Radon" is a contraction of "pteranodon " and may also have been chosen to suggest radiation). Radon is usually referred to as Rodan stateside, possibly to avoid confusion with the atomic element Radon.