Melmac was a substance that the planet Melmac was composed of. (ALF: "A.L.F.")
Melmac, the planet, was located in the Aldente Nebula in the Andromeda Galaxy. It was the homeworld of ALF. Residents of the planet were called Melmacians and they were characterized as being short, furry creatures who have advanced age longevity and multiple stomachs. Melmac was located six parsecs past the Hydra-Centaurus Supercluster. Melmac was very much like Earth but it had two moons, it was oddly shaped and made of melmac. Melmac had green skies and blue grass, and it orbited a purple sun. (However, on "Turkey in the Straw: Part 2," ALF claims that Melmac has an orange sky and green clouds). But have to 4 lungs