It was officially announced that John Constantine would be appearing on Arrow this coming season at the TCA press tour yesterday, with Matt Ryan reprising his role from the cancelled NBC series as DC’s occult hero, and now we're getting some more info on just how this appearance will work.

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I spoke to Arrow executive producer Wendy Mericle at TCA, and she delved a bit more into Constantine's appearance in Arrow: Season 4’s fifth episode, “Haunted."Regarding how Constantine will fit in on the show, it turns out he will be involved in a big question going into this season - just how will Sara Lance be resurrected? After all, Sara was killed at the start of Season 3, but we know she’ll be back as a part of the upcoming spinoff DC’s Legends of Tomorrow, with Caity Lotz returning as Sara and her new alter ego, White Canary.Said Mericle, of Constantine’s role on Arrow, “It was born more out of the storyline for Sara Lance. We needed someone to come in and help bring her back. He felt like the most exciting possibility and we’re just thrilled to get him. He brings such a different element to the show.”In terms of whether we should assume that this is firmly considered the same version of Constantine from his own series (and thus retroactively linking the Constantine series to the Arrow-verse), Mericle said, “Absolutely. He is coming in fully as who he was on the show. We’re getting wardrobe. We’re very excited to have him. He’s a tremendous actor. It’s so cool to have that cross-pollination. We are very lucky and DC was very generous letting us have him.”CW president Mark Pedowitz had referred to his appearance as a “one-shot.” When I asked Mericle if we might see him again, she replied, “Right now, it really was -- it’s born out of necessity for this particular story. I think Mark was right, it is a one off and this is what we’re focusing on right now.”