Kozz
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Kozz
A green-skinned Martian who Superboy encounters in a December 1958 chronicle. Kozz is distinguished in the chronicles as having purposely caused Superboy's first exposure to Red Kryptonite, splitting the Boy of Steel into two separate and distinct individuals, a heroic Superboy and an evil Clark Kent (Adv No. 255, Dec 1958: “The Splitting of Superboyâ€).
Although he is a native of the planet Mars, Kozz does not appear to belong to the same race as that of Superman's ally and fellow Justice League of America member J'onn J'onzz.