The Metalunans are a fictional alien race featured in the 1958 science fiction film, This Island Earth. They are depicted as advanced beings from the planet Metaluna, known for their intelligence and technological prowess. Metalunans have a distinctive appearance, characterized by their large heads, bulging eyes, and greenish skin, which sets them apart from humans. In the film, the Metalunans are portrayed as being in conflict with another alien race, the Zinths. They seek assistance from Earth scientists to help defend their planet from destruction. The Metalunans' advanced technology and unique culture serve as a backdrop for the film's exploration of themes like cooperation and the consequences of war.