"Arrow's" Quentin Lance has had a pretty rough go of things over the past five seasons. First, he believed his daughter Sara died when she went down with the Queens' ship, only for her to return to him as an assassin -- and die soon after that. Through the power of the Lazarus Pit and some Constantine magic, she came back to life, just in time for her sister Laurel to die at Damien Darhk's hand. Now, Sara is off on a journey through time, looking to exact revenge on Darhk, and Quentin has been left alone to dwell ever since.

As such, Quentin has hit the bottle again, but Thea Queen hopes to put a stop to that. At the celebration of "Arrow's" 100th episode, Paul Blackthorne -- who plays Quentin -- told CBR that Thea's offer of help will lead the two to develop a father/daughter relationship as the season moves forward.

Now that he has a job within Oliver's office, will Quentin be able to get a handle on his drinking?

Oh! I don't know. You'd think he'd want to behave responsibly being that he's deputy mayor now, you know? Put the bottle down, give it a break. But I don't know! Who knows? God knows! We'll see.

What would you say his dynamic is with Thea now that she's done him this huge favor?

Well, it's interesting, because she has this rather strange father situation and I have my desperate daughter situation and there definitely seems to be a bit of role replacement going on in there somewhere. It's interesting, because we talked about it in the scenes, and neither of us sort of realized. We both felt the characters wouldn't realize that was happening for quite a long time. It's not like, "Oh, she feels like my daughter!" It's quite unspoken, but of course it does certainly feel like that. It's like, "I recognize this feeling, but it's with somebody else." It's been interesting playing on that dynamic with her.

Now, Quentin does have a living daughter --

She just doesn't come home too much!

Are you going to be a part of this 100th episode?

Yes!

Then are you going to cross paths with Sara, perchance?

We'll have to wait and see.

Quentin has seen some serious shifts in his life. He's seen magic and metahumans and magic --

No wonder he's drinking!

What is his reaction to this latest alien invasion?

He can never quite get his head around what the hell is going on in this world. Flummoxed and bemused, as ever.

Starring Stephen Amell as the Emerald Archer, "Arrow" airs Wednesdays at 8 pm ET/PT on The CW. The series also stars Emily Bett Rickards, David Ramsey, John Barrowman, Willa Holland and more.