Kathy Warren
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Kathy Warren
A small blonde child who lives with the Kents for a short time and gains ultra-intellect after an encounter with a weird space brain in Superboy's possession (SB No. 176, Jul 1971: "The Secret of Superboy's Sister!"). After helping the Boy of Tomorrow in defeating an alien invasion, it is assumed that she returns to normal. However, Kathy again shows enhanced thinking abilities in a later adventure, including having a temporary memory of Superboy's secret identity (SB No. 191, Oct 1972: "The Kid with a Super-Brain!").