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Nightmare was Scarecrow's pet crow.
Nightmare has no full origin. Its unknown where or how his owner, Jonathan Crane acquired him.
AppearancesEditNightmare has a short cameo in epsidode 904 of the Super Friends titled "The Fear."
It should be noted that even though Jonathan Crane has a fear of birds and takes the image of a scarecrow, it's somewhat odd that a crow wouldn't be frightened of Jonathan Crane and vice-versa.