From The Hollywood Reporter:
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Constantine lives again — sorta.
Matt Ryan, who starred as the title character on NBC’s short-lived DC Comics drama, will reprise his role on an episode of Arrow’s fourth season.
Ryan’s John Constantine — who struggles with his faith as he is haunted by the sins of his past and suddenly is thrust into the role of defending humanity from the gathering forces of darkness — will guest-star in the fifth episode of Arrow’s fourth season, titled “Haunted.”
According to a description sent by The CW, Constantine will provide valuable support to Oliver (Stephen Amell) when arrows just won’t suffice.