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John Constantine was originally the main character in DC Comics Hellblazer series. Matt Ryan played John briefly in when Constantine was on NBC from 2014-2015, unfortunately, the show didn't have enough viewers so it was taken off air. However, Matt Ryan made a comeback as John Constantine in the fifth episode of the fourth season of DC Comics Arrow TV show. In this episode we learn that Oliver Queen was acquainted with John from a brief encounter from when Oliver was struggling for survival on the island of Lian Yu. Later in the episode Oliver calls up John asking for a favor in helping to return Sara Lance (The Black Canary) back into her regular self.
Contributed by Calleigh Henson