John Constantine: Hellblazer #1 (January 1988) sees the beginning of a two-part story that reintroduces Constantine and Emma, both first seen in Swamp Thing, and introduces several supporting Hellblazer characters. It makes explicit references to the events of Swamp Thing issue 37, in which Emma was killed.
The story sees John travelling from London to Africa and then the US to combat a hunger spirit that has been unleashed on New York City.
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