"Matter-Eater Lad comes from the planet Bismoll. Gradually, over a period of eons, microbes on that world made all food poisonous. As a result, evolution there transformed the inhabitants so that they could eat anything - glass, metal, chemicals, etc. - without being harmed in the least!" (Adv No. 316, Jan 1964: "Origins and Powers of the Legion of Super-Heroes!")
Matter-Eater Lad (Tenzil Kem) is a member of the Legion of Super-Heroes.