Astra was a planet populated by a race of sentient, bald, yellow-skinned humanoids. Astrans had the natural ability to telekinetically manipulate metallic substances. While most Astrans used their powers to create beautiful, metal sculptures, one Astrans, Molyb, sought to use his gifts to conquer the world. For this, he was deemed a criminal and sent into exile. Molyb renamed himself the Metal Master and explored the universe in search of a world rich in metal and ripe for conquest. He eventually came to Earth but was defeated by the Hulk.