In the late 1930s, Superman co-creator Jerry Seigel and Houman co-creator Bernard Baily gave us one of the most mysterious characters of the Golden Age, or any age for that matter - The Spectre. From his earlies arrival, the ghostly superhero created quite a sensation. According to Wikipedia:
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"The Spectre's career began in the late 1930s when hard-boiled cop Jim Corrigan was murdered. His spirit was refused entry into the afterlife, however, and, in the guise of a grey-skinned humanoid being in green cloak, gloves, trunks and boots (blue garments appeared on the cover and symbolic splash panel of #52), it was assigned by an entity referred to only as "The Voice" (generally conceded to be God) to eliminate all evil from the world.