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Year One

Scarecrow's body is found in S.T.A.R. Labs by the Flash, his face twisted into a smile, a tell-tale sign of poisoning by the Joker's laughing toxin. Joker would use Scarecrow's fear toxin laced with kryptonite to make Superman see his wife Lois as Doomsday, causing the Man of Steel to accidentally murder her and seal Metropolis's fate.

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