X-Kryptonite

X-Kryptonite is an isotope created from Supergirl experimenting on Kryptonite in order to gain a cure from its debilitating effects over Kryptonians. Instead, all she did was transform its state so it could temporary copy Kryptonian powers onto regular animals (such as Supergirl's cat, Streaky) and humans.

Early history
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Scooby-Doo! Team-Up
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Appearances

 * Scooby-Doo! Team-Up
 * #37.