As the team return to the hub, Jack has his hand on Ianto’s shoulder. Ianto doesn't resist.

"Tosh," Jack orders as he puts Owen on the couch, "get everything from the weapons room. Fast as you can."

"It's locked down, there's no manual override," Tosh protests as she comes to them with a torch.

"Just open the store!" Jack barks and Toshiko runs to the weapons locker.

That dealt with, Jack turns to Ianto. "On your knees! Hands above your head!"

Ianto obeys, expressionless.

"Jack, for God's sake! What are you doing?!" Tosh cries

"Tosh! I gave you an order! Gwen, help her!" He leans in closer, the gun still in Ianto's face. "Did you know that thing was down there?"

"I put her there."

Jack grabs Ianto by the hair, pressing the barrel against his temple. "You hid a Cyberman within Torchwood?! And you didn't tell us? What else are you keeping from us?"

Ianto looks up at him, defiance and grief in his face. "Like you care. I clear up your shit. No questions asked and that's the way you like it. When did you last ask me anything about my life?"

At this Jack lowers his gun. There's a loud click as he uncocks the hammer.

Ianto lowers his eyes. "Her name's Lisa. She's my girlfriend."

"Why didn't you tell us?" Gwen interjects. "We could have helped you."

"Torchwood exists to destroy alien threats," Ianto says impatiently. "Why would I tell you about her?"

"A little loyalty, perhaps?" Owen calls out, holding his injured neck.

"My loyalty's to her! She worked for Torchwood. She was caught up in battle. I owe it to Lisa--we owe it to her--to find a cure." He's begging to them now--for understanding, for support.

"Ianto," Jack says, "you have to believe me. There is no cure. There never will be. Those who are converted stay that way. Your girlfriend will not be the exception."

"You can't know that for sure," Ianto protests, a man still clinging to hope.

"Look," says Jack, "you need to know what's happening here. Because this is where these things start. Small decisions that become mass slaughter. These creatures regain a foothold by exploiting human weakness. Then they take a base. Rebuild their forces. And before you know it, the Cyber race is spreading out across the universe, erasing worlds, assimilating populations. All because of the tiny beginnings here. We need to stop her ... together!"

Ianto finally gets to his feet and lowers his arms. "You're not listening to me! The conversion was never completed!"

"She already tried to kill Gwen! You think she's gonna stop there? There is no turning back for her now!"

"I'm ... not giving up on her. I love her." His voice breaks. "Can you understand that, Jack? Haven't you ever loved anyone?"

There is the briefest of pauses before Jack steps in close to him and says, "You need to figure out whose side you're on here. Because if you don't know ... you're not going to make it out of this alive." He turns away.

Owen says, "There's no way this weapons store's gonna open."

"It's going to take six hours for the power to come back online," Toshiko adds.

"Let me talk to her," Ianto pleads. "I can still save her. Save all of us. She's not a monster."

Which is, of course, the moment Lisa chooses to step back into the hub, her boots echoing on the cement floor.

"Ianto!" Gwen calls to him, but Ianto ignores her as he moves closer to Lisa.

"Lisa..."

Lisa turns and looks at Ianto, her machinery grinding.

He opens his hands and says simply, "It's me."