Radon, known as Rodan in English releases, is a giant pterosaur-like kaiju featured in the Godzilla (Gojira) film series. First appearing in the 1956 film 'Rodan,' Radon is characterized by its immense wingspan, supersonic flight, and destructive sonic booms. In the Godzilla universe, Radon alternates between being an adversary and an ally to Godzilla, often playing a crucial role in battles against other monsters. The character symbolizes the uncontrollable power of nature.