Element Sigellian
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Element Sigellian
While Superboy was imprisoned on Superboy Planet, a Superboy trophy explodes, launching an atomic chain reaction, releasing the element sigellian into the atmosphere, turning everything blue. This element is as deadly to the Legion of Super-Heroes as kryptonite is to Superboy. Superboy releases a super-shout and changes the molecular structure of element sigellian, rending it harmless (Adv 267, Dec 1959: "Prisoner of Super-Heroes").