Arrow type TV Show network The CW genre Superhero

With bloodthirsty Sara on the loose in Star City, Team Arrow has to turn to one of Oliver’s (Stephen Amell) allies to restore her soul. Enter Matt Ryan, reprising his titular role from NBC’s short-lived Constantine.

“It just felt organic,” says showrunner Wendy Mericle, noting that Team Arrow will have varying reactions to Constantine’s arrival. “Oliver’s very welcoming. [Oliver has] a deep well of experience with things that don’t make sense and science can’t explain, so he’s very open to the idea.”

But Laurel (Katie Cassidy) and Diggle (David Ramsey) are a different story. “Laurel just wants her sister back, so she’s willing to do whatever it takes, and Diggle will be, not a skeptic, but certainly maybe not as welcoming as Oliver might be.”

They have little choice once Oliver discovers that Sara has been resurrected. “He has an interesting reaction,” Mericle says. “He finds out in a very dynamic and interesting way in action. He’s shocked. He did not see that coming. Laurel’s been keeping this very much under wraps. He’s also somewhat relieved to know that she’s out there, but his biggest concern is that he quickly puts two and two together and knows how Laurel and Thea [Willa Holland] pulled this off. He’s worried for the safety of the city and for Sara’s safety as well.”

As he should be. It was recently revealed that those who are healed in the Lazarus Pits come back with pieces of other souls, causing them to be bloodthirsty until they avenge themselves by slaughtering the person who killed them. In this case, it’s Thea, whom Sara will target in Wednesday’s episode. “It gets scary,” Mericle says. “Obviously Oliver knows that and is very concerned. When that starts to happen, it escalates.”

“It makes for a really cool scene between him and Laurel,” Mericle continues. “It interestingly puts their friendship and their relationship on a completely different footing for the rest of the season, which we actually are really excited about.”

But getting Sara’s soul back won’t be an easy feat. “What we typically do in our Act 5 sequence, we have a lot of action,” Mericle says. “This is a different way of doing that. Constantine takes them to a different place, they fight, and they get her soul back. It’s a pretty cool, interesting, very different sequence for us on the show.”

One hint: The photo above is deceiving.

Arrow airs Wednesdays at 8 p.m. ET on The CW.