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'''X-Kryptonite''' An artificial isotope of [[Kryptonite]] that is accidentally created by [[Supergirl]] in a failed attempt to create an antidote to Kryptonite exposure, X-Kryptonite is able to temporarily give [[Streaky]] the Supercat powers beyond those of mere mortal cats, equal to those possessed by the [[The Girl of Steel|Girl of Steel]] (Act No. 261, Feb 1960: "Supergirl's Super-Pet"; and others). It is later revealed that X-Kryptonite can weaken super-powered Kryptonians as well (SF No. 203/1, Sep/Oct 1980: "The Supergirl from Planet Earth"). [[Category:Entries]] [[Category:Kryptonite]] [[Category:Supergirl]] [[Category:Silver Age (1956-1970)]] [[Category:Bronze Age (1971-1986)]]

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