The Doctor walked up to the captain. "All we needed to do was let Skaldak go and he'd have forgotten us. But you attacked him. You declared war. Harm one of us and you harm us all. That's the ancient Martian code."

A beeping noise was coming from the Professor's headphones.

"You hear that? Skaldak has sent out a distress call. He will bring down the fires of hell just for laying a glove on him."

"Unless you talk to it?"

"I'm the only one who can."

"No. Out of the question. We're not losing you. I'll do it."

"What?"

"You can talk to it through me."

"Skaldak won't talk to you. You're an enemy soldier."

"And how would he know that?"

"A soldier knows another soldier. He'll smell it on you. Smell it on you a mile off."

"And he wouldn't smell it on you, Doctor?"

"Just let me in there before it's too late. It can't be you or any of your men."

"Well, it can't be you."

"Oh for god's sake," Elise groaned, rolling her eyes. She stepped forward. "I'll do it."

The Doctor spun around. "You? No! No! No way. You're not going in there alone, Elise. Absolutely not. No, no. Never."

"You promised! No more training wheels. Let me prove myself."

The Doctor sighed. "Ellie..."

"No! Don't 'Ellie' me. I'm yours and River's daughter. If anyone can do this, it's me. So come on. Let me be your brave, clever girl."

The Doctor finally walked up to her. "One sign of danger and I'm pulling you out, understood?"

Elise nodded and he placed his hands on her temples.

Elise opened the door to the torpedo room and stepped inside. She placed the radio headset on her head. She had initially argued against it, but the Doctor wouldn't let her leave without it.

"Ready, Elise?" her father asked her.

Elise nodded, running through the procedure the Doctor had implanted in her mind.

"Okay."

"Grand Marshal Skaldak." Elise clenched her fist and placed it against her left shoulder. "Sovereign of the Tharsyssian caste. By the moons, I honor thee."

"You can step closer to him," the Doctor told her.

Elise confidently stepped closer to him. "Grand Marshal, we're sorry about this. It isn't what you deserve."

The power went out.

"Great," Elise muttered.

"It's okay, Elise. Keep going," her father encouraged her.

"You're a long way from home. Five thousand years adrift in time. Please, let us help you. You are not our enemy."

"And yet I am in chains," Skaldak said.

HELP ME! The Doctor heard her scream in his mind. Timelords were connected telepathically, but normally Elise kept her mental barriers up, but he heard her clear as day.

The Doctor's voice came over the PA system. "You are restrained until we can trust each other, Skaldak. You would do exactly the same in my position, and don't even think about using that sonic weapon. Not in the torpedo room."

Torpedo room? That was great. She was standing in a room full of bombs.

"I was Fleet Commander of the Nix Tharsyss. My daughter stood by me. It was her first taste of action. We sang the songs of the Old Times. The Songs of the Red Snow. Five thousand years. Now my daughter will be dust. Only dust."

"You have a daughter?" Elise asked. She could use this. "I'm a daughter myself. So I know how it feels to be connected to someone on that level."

"Your people live on Skaldak. Scattered all across the universe. And Mars will rise again, I promise you. Just let me help you," the Doctor begged.

"We can get you back to your family," Elise told him.

"I require no help. There will be no help."

Elise stepped closer to Skaldak.

"Careful, Elise," the Doctor told her.

"I'm okay."

"No, listen, Elise, don't get too close."

As Elise got closer to him, she realized something was very wrong. "We might have a slight problem."

"What?"

Elise reached out and touched the helmet. It fell back, revealing an empty void. "He's gone!"

"Gone? Gone? Gone? What do you mean, gone?"

"Gone! As in, not here anymore!"

"It is time I learned the measure of my enemies. And what this vessel is capable of," Skaldak's voice said.

"No, no, no. Skaldak!" the Doctor yelled.

"Harm one of us and you harm us all. By the Moons, this I swear."

"Elise, get out of there. Get out!"

Elise ran to the door and struggled to get it open. As soon as it was open, something ran past Elise and the others.

"Elise! Elise!" the Doctor yelled.

Elise quickly got up and stepped out of the torpedo room.

"Elise!" The Doctor ran up to her and started fussing over her.

Elise batted his hands away. "I'm fine! I'm okay! Now, where did he go?"

"Doctor? The signal. It's stopped," the Professor said.

The Doctor grabbed the headphones and listened. "Skaldak got no answer from his Martian brothers. Now he's given up hope."

"Hope of what?" the captain asked.

"Being rescued. He thinks he's been abandoned. He's got nothing left to lose."

"But what can he do, stuck down here like the rest of us? How bad can it be?"

"This sub's stuffed with nuclear missiles, Zhukov. It's fat with them. What do you think Skaldak's going to do when he finds that out? How bad can it be? How bad can it be? It couldn't be any worse."

There was a crashing noise and water started pouring in.

"Did you have to ask that?" Elise snapped.

"Okay. Spoke to soon."

They back to the control room, where the captain addressed the crew.

"Comrades, you know our situation. The reactor is drowned. We are totally reliant on battery power and our air is running out. Rescue is unlikely, but we still have a mission to fulfill. If the Doctor is right, then we are all that stands between this creature and the destruction of the world. Control of one missile is all he needs. We are expendable, comrades. Our world is not. I know I can rely on every one of you to do his duty without fail. That is all."

The crew went in search of weapons.

"Even if a missile did get launched, that wouldn't be it, would it?" Clara asked the Doctor.

"It?"

"End of the world. Game over. I mean, what if they fired one by accident. What would happen then?"

"I told you, Clara. Earth is like a storm waiting to break, right now. Both sides baring their teeth, talking up war. It would only take one tiny spark."

"Yeah, but the world didn't end in 1983, did it, or I wouldn't be here."

Elise shook her head. "That's not how time works. History's in flux. It can be changed. Re-written."

The crew came back with rifles.

"How many of us are left?" the Doctor asked the captain.

"Twelve. And we can't find Stepashin."

"We split up and comb this sub. One team stays here to guard the bridge."

"That's it? That's the plan?"

"Well, it's either that or we stay here and wait for him to kill us."

"Okay."

"Is it true you've never seen one outside of its shell suit?" Clara asked the Doctor.

"Shell suit? Clara!" Clara shrugged.

"For an Ice Warrior to leave its armor is the gravest dishonor. Skaldak is desperate. He is deadly and we have got to find him."

"Will this help?" the Professor asked, holding up the Doctor's sonic screwdriver.

"Ah! You saved it!" The Doctor grabbed it from him.

Elise pulled out her sonic screwdriver.

"You've had that the whole time!" the Doctor yelled.

Elise shrugged. "They didn't search me, remember? And you never said anything."

"It was on the floor with this," the Professor said. He held up a Barbie doll.

The Doctor took it and kissed it. "Ah, Professor, I could kiss you."

"If you insist."

"Later."

"So, why have you got a cattle prod on a submarine?" Clara asked as they ventured through the submarine.

"Polar bears," the Professor said.

"Ah, right."

"We run across them when we're drilling. Can be quite nasty, you know."

"I'd swap one for an Ice Warrior any day. Cuddlier."

"Courage, my dear. I always sing a song."

Elise rolled her eyes as the Doctor set off a series of alarms.

"What?"

"To keep my spirits up."

"Yeah, that would work, if this was Pinocchio."

"Do you know Hungry like the Wolf?"

"What?"

"Duran Duran. One of my favorites. Come on."

"I'm not singing a song."

The Doctor opened a hatch and stuck his head inside.

There was a growl.

"What was that?" Clara asked.

"Pressure. Just pressure. We're seven hundred meters down, remember?" the Doctor reassured them.

"Don't worry about it. Think of something else," the Professor said. He started singing. "I am hungry like the wolf."

Elise scrunched her nose in disgust. This body preferred pop-punk and rock music, unlike her first body who preferred music from the 60's and 70's. Apparently her bodies matched the music they liked with the way they dressed.

"I'm not singing," Clara told the Professor.

"Don't you know it?"

"Course I know it. We do it at karaoke, the odd hen night."

"Karaoke? Hen night? You speak excellent Russian, my dear, but sometimes I don't understand a word you're talking about."

Suddenly there were screams and the group started running towards them.

The bodies were completely torn apart.

Elise screamed.

The Doctor rushed over to her and she hid her face in his coat.

"It's okay. It's okay," he cooed.

This Elise may have been more confident, but seeing people die still affected her. The last time she'd seen devastation like this was when she was escaping Gallifrey.

"Good God. Torn apart. It's a monster, a savage," the Professor said.

"No, Professor. Not savage. Forensic. Well, he's dismantled them. Skaldak's learning. Learning all about you. Your strengths, your weaknesses. Come on." He gently led Elise out of the room and the group went down a passageway.

The Doctor helped Elise to sit down as he soniced a porthole. "Stay here," he told Clara and Elise.

"Okay," Clara said, answering for the comatose Timelord.

"Stay here. Don't argue."

"I'm not."

"Right. Good." He went up a ladder, leaving Elise and Clara with the Professor.

He reminded Elise of someone. Someone she couldn't quite place.