Biotex

Biotex is a planet with an atmosphere of very dense smog. The planet has deadly microbes, so the dominant species evolved into living metal, which allowed them to survive under such harsh conditions. When the Bem scientist Ceneca-9009 visited the Biotex, she saw the metallic Biotexans and was moved with pity. She invented the Derobotizer to turn them into creatures of flesh. This had disastrous results, causing the entire race to become extinct. Biotex has been presumably unpopulated since then, with the exception of the microbes.