Metaluna is a fictional planet featured in the 1955 science fiction film This Island Earth. It is depicted as a technologically advanced world facing destruction due to a devastating war. The inhabitants, known as Metalunans, are portrayed as intelligent beings with a unique appearance, characterized by large heads and advanced mental abilities. In the film, a scientist named Cal Meacham is recruited to help the Metalunans develop a powerful energy source to save their planet. The story explores themes of scientific ethics and the consequences of war, highlighting the challenges faced by civilizations in crisis.