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Crisis on Infinite Earths #3

Harbinger walks into the Monitor's sanctum as he continues testing young Alex Luthor. Luthor is aging at an accelerated rate, and is now the physical age of an adolescent boy. The Monitor discovers he is composed of both positive matter and antimatter, and believes that this composite life form may hold the key towards stopping the Crisis.

Description adapted from DC Database contributors, Crisis on Infinite Earths Vol 1 3 · CC BY-SA 3.0. Text adapted for this entry.