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Evolution Serum

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Evolution Serum is a concoction invented by the Kryptonian Circe and passed down to her descendant on Earth. It has the effect of morphing whoever drinks it into whatever animal they most resemble by nature. One of the ingredients is a small amount of Kryptonite.

Superman once was tricked into drinking the serum, and was transformed into a Lion for a short time. (The Lady and the Lion)

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