Arrow Season 4 Spoilers: Everything You Need To Know
8. Constantine Will Show Up
Magic and mythicism is coming to Arrow this season, and one of the episodes we know it'll definitely be appearing in is episode 5, Haunted. That's when Matt Ryan is scheduled to guest star as the character John Constantine, who he also played on the now-cancelled NBC series.
It's a slightly unusual move for a show to bring in an actor from another network's show to play the same role (although the cancellation probably helped), but there's high hopes that he will work on Arrow in a way he never quite managed to on his own.
It's likely that he'll be dealing a lot with resurrection, and it may be that he has a big part to play in helping Thea, who is going to be struggling quite a lot with the side-effects of being revived by the Lazarus Pit last year.