After Laurel got Thea and the others to the ship, she and Evelyn got Thea settled in the on board infirmary.
"I'm fine, really." Thea insisted, though her heavy breathing suggested otherwise.
"Evelyn, go get on the radio and get a doctor here now. From what it sounds like, Thea's likely to go into labor at any moment." Laurel said and Evelyn nodded before walking out.
"I just hope that Roy gets here before the time comes." Thea panted.
"He will. Oliver is going to find him." Laurel assured her.
"Why is he working with Slade Wilson?" Thea asked.
"Look Thea, I'm not thrilled about it either and I know that he isn't either, but desperate times called for desperate measures. We can only hope that the Slade Wilson Oliver used to know is the Slade who's with him right now." Laurel said.
When Oliver, Tommy, Slade and Nyssa arrived at the fortress, Oliver, Slade and Nyssa were in shackles to make their approach seem authentic.
"Okay, this is where we split up. Slade, Nyssa, search the monastery for my son. Tommy, take me to the rest of prisoners." Oliver said as they entered and Tommy released Slade and Nyssa.
"Copy that." Tommy said as he did his best to look like he was still Prometheus.
"See you soon kid." Slade said as he and Nyssa ran off through the halls.
"I don't understand how you can trust me so easily after everything I've done." Tommy said as he and Oliver walked through the fortress.
"Because compared to all the things I've done over the past ten years, pretty all of them in my father's name, the things you did as Prometheus is nothing, especially considering you weren't in control of your actions." Oliver said.
"Yeah well, maybe you shouldn't trust me so easily." Tommy said as suddenly he slugged Oliver and knocked him out, right as Black Siren approached.
"Tell Talia I've got him." Prometheus said and Black Siren grinned at the sight of Oliver Queen, unconscious.
"Oliver." John said as Black Siren and Prometheus dragged Oliver into the room that Rene, Donna, Quentin, Roy and John were all being held in.
"Don't blame me. Mr. Merlyn here is the one who gets credit for this trophy." Black Siren said.
"Tommy, you son of a bitch." Quentin growled at his daughter's ex-boyfriend.
"I can't believe I thought I actually got through to you. I was foolish to trust you." Oliver said, sounding betrayed.
"Anger is a powerful motivator. You of all people understand that." Prometheus said as he and Black Siren left.
"Where's my son?" Oliver asked the others.
"William, Talia got him to?" John asked.
"She sent me a video of William begging for help and Samantha was also being held prisoner here. He is on this island somewhere and we need to find him." Oliver said.
Nyssa was scouting a corridor when she came across the real person she'd been looking for.
"Talia." Nyssa growled at her older sister.
"I'm surprised to see you up and about so soon after your little accident." Talia said smugly.
"You of all people know that it would take more than a few bruises to stop a daughter of Ra's al Ghul." Nyssa said.
"I heard that you rejected the ring of the demon's head. What a foolish young woman you've become." Talia mocked.
"Well it was your selfishness that forced me to grow up alone." Nyssa said.
"Our father would never have passed his mantle down to a woman. I had to forge my own path." Talia said.
"And you left me knowing that I would suffer at father's hand. And if anything, he'd be ashamed of you, since while father was many awful things, dishonorable was not one of them. He would be ashamed that you've perverted his teachings the way you have, teaching your followers to fight without honor." Nyssa said.
"You wish to settle this score now?" Talia asked as she unsheathed her sword and Nyssa did the same as they dropped their bows and engaged in combat.
Once Oliver was sure they were clear, he dropped his betrayed disguise.
"Alright, let's get out of here." Oliver said.
"I think Merlyn hit you a bit too hard on the head when he knock you out." Quentin said as Oliver pulled a small item from his sleeve.
"What's that?" John asked as Oliver used the item to remove his cuffs.
"Paper clip, sometimes the most old fashioned tricks are the best ones." Oliver said as he released the others.
"Quentin, there's an Argus supply ship docked on the east shore. Laurel's there now with everyone else. Get Donna there and tell Laurel we could use her help." Oliver said and Quentin nodded.
"I'm going to." Roy said and Oliver nodded as he, Quentin and Donna left the room.
"The rest of us need to find Talia, since if we find her, we find my son." Oliver said Tommy reentered the room, carrying Oliver's bow and quiver.
"Wait, Tommy was only pretending to screw you? Does that mean?" John asked.
"Yeah, I got through to him, but this was the best way for us to get in here." Oliver said.
"Us? Who else is here?" Rene asked as someone that John recognized all too well.
"Slade, you son of bitch." John said as he slugged him.
"Ok, I deserve that." Slade said.
"John, calm down, he's on our side." Oliver said.
"Oliver, this man murdered your mother, how can you say that he's on our side?" John demanded.
"Because he helped us free the other hostages and the Mirakuru is out of his system." Oliver said.
"I'm not expecting you to forgive me Mr. Diggle, but right now, if we're to survive, we must be willing to work together." Slade said.
"I can't believe you're considering this." John said.
"No time to argue, now let's move, did you find William?" Oliver asked.
"I've searched everywhere, he's not here." Slade said as Tommy handed Oliver back his gear.
"We need to find Nyssa and Talia now." Oliver said.
"Don't think that'll be a problem hoss." Rene said Nyssa came in the room, battling with Talia as her forces entered the room.
"Hello Oliver, welcome back to Purgatory." Talia said.
"You bitch." Tommy said.
"I see you found a way to get your friend back. I'd congratulate you, but you are still vastly outnumbered." Talia said.
"Deal with her soldiers, Talia's mine." Oliver said and the others nodded as the final battle began.