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The Black Mercy plant hails from a story presented by DC Comics. It was introduced in the shared continuity that existed in DC's core titles prior to the events of the Crisis on Infinite Earths maxi-series (1985-1986). It first appeared in Superman Annual #11 in 1984. It was harvested by an alien conqueror known as Mongul and has been applied to several different DC heroes including Superman, Batman, Green Lantern, and Supergirl.
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