The Doctor walked closely behind Rose, watching her movements. Something was clearly off about her but he couldn't quite figure out what.

Once he got over the initial shock and joy of being kissed by Rose, he realized she didn't feel right. He'd felt her presences in his mind before, he knew what it was like to kiss Rose Tyler, but this time it wasn't the same. He considered the fact that the last time he'd kissed her, she had the whole Time Vortex in her mind.

That theory went out the window when they went to the terminal. She wouldn't normally be so cold and calculating, and she definitely wouldn't know anything about the technology on New Earth. The nurses were hiding something and they clearly must have done something to Rose while she was out of his sight. He was going to get to the bottom of this.

After a few flights of stairs, they found row after row of glowing green containment pods. It seemed like they went the whole height of the hospital, possibly even farther down past the ground level. They walked toward one of the many pods. The Doctor soniced it open.

"That's disgusting." Rose said in a very uncharacteristically uncaring voice at the sight of the sick man strapped to the chair inside. "What's wrong with him?"

"I'm sorry." The Doctor said, flooded with remorse over this man's fate. "I'm so sorry."

The Doctor gave the man one last apologetic look as he closed the door to the pod. He moved to the next one, finding a woman this time. She was strapped down to a chair and covered in pox, just like the one before. Her eyes were glazed over as she stared at the Doctor and Rose.

"What disease is that?" Rose asked.

"All of them. Every single disease in the galaxy. They've been infected with everything."

"What about us?" Rose asked in that un-Rose-like voice. "Are we safe?"

"The air's sterile. Just don't touch them." The Doctor answered, trying to keep his voice level. He felt so much rage as he closed the door to the pod and walked to the edge of the balcony, looking out at the endless rows of pods before him.

"How many patients are there?"

"They're not patients."

"But they're sick."

"They were born sick. They're meant to be sick. They exist to be sick." The Doctor shouted. "No wonder the Sister's have got a cure for everythin', they've built the ultimate research laboratory. A human farm!"

The Doctor tried controlling his temper, but knowing that something was wrong with Rose now was throwing him off balance. Whatever those nurses had done to her scared him. The Doctor marched off, ready to find one of the Sister's and confront them. He knew he had to stop what was going on here and get Rose back to normal.

"Why don't they just die?" Rose asked callously as she followed.

"Plague carriers. The last to go."

"It's for the greater good." Came a voice down the hall.

"Novice Hame." The Doctor said as he turned to face her. "When you took your vows, did you agree to this?"

"The Sisterhood has sworn to help." Novice Hame answered kindly.

"What, by killing?" The Doctor yelled, infuriated by the ease in her tone.

"But they're not real people." She justified. "They're specially grown. They have no proper existance."

"What's the turn over? Hmm?" The Doctor asked hotly as he approached her. "A thousand a day? Thousand the next? Thousand the next? How many thousands? For how many years? HOW MANY?"

"Mankind needed us. They came to this planet with so many illnesses, we couldn't cope! We did try, we tried everything. We tried using clone meat and bio-cattle, but the results were too slow. So, the Sisterhood grew its own flesh. That's all they are. Flesh."

"These people are alive!"

"But think of those humans out there, healthy and happy, because of us."

"If they live because of this then life is worthless."

"Who are you to decide that?"

"I'm the Doctor. And if you don't like it, if you wanna take it to a higher authority, there isn't one. It stops with me."

"Just to confirm," Rose interrupted. "none of the humans in the city actually know about this?"

"We thought it best not to…" Novice Hame started.

"Hold on." The Doctor stopped her. "I can understand the bodies, I can understand your vows, but one thing I can't understand. What have you done to Rose?"

"I don't know what you mean."

"I'm being very, very calm." The Doctor continued, looking at Novice Hame so hard he almost could pierce her skull with his stare. "You wanna be aware of that. Very, very calm. And the only reason I'm being so very, very calm is that the brain is a delicate thing. Whatever you've done to Rose's head, I want it reversed."

"We haven't done anything."

"I'm perfectly fine." Rose answered in an easy-going tone. Inside, unknown to the Doctor, the real Rose was watching anxiously, knowing Cassandra wouldn't give up without a fight when she was caught.

"These people are dying and Rose would care." The Doctor answered, still looking at only Novice Hame.

"Ugh. All right, clever clogs." Rose said, all pretense dropped as she turned the Doctor around and grabbed his tie, pulling him slowly towards her. "Smarty-pants. Lady-killer."

"What's happened to you?" The Doctor asked.

"I knew something was going on in this hospital, but I needed this body and your mind to figure it out."

"Who are you?

Rose pulled his ear to her lips and whispered. "The Last Human."

"Cassandra?" He asked in disbelief as he pulled away.

"Wake up and smell the perfume." She pulled the small vile from her shirt and sprayed it right in the Doctor's face.

Immediately, he was out cold. When he finally came to, the first thing he noticed were alarms blaring in the distance. Oh, how Cassandra liked to make a scene. As he gained consciousness more and more, he noticed his arms were restrained. He was in one of those pods, strapped to the chair.

"Let me out! Let me out!" He called out.

"Aren't you luck there was a spare? Standing room only." Came a very Cassandra-like voice. He could see Rose through the green tinted glass, but he knew it was Cassandra in there.

"You've stolen Rose's body!"

"Over the years, I've thought of a thousand ways to kill you, Doctor, and now, that's exactly what I've got. One thousand diseases. They pump the patients with a top-up every ten minutes. You've got about, oh, three minutes left. Enjoy."

"Just let Rose go, Cassandra." The Doctor just about begged.

"I will." She insisted. "As soon as I find someone younger and less common, then I'll junk her with the waste. Now hush-a-bye. It's showtime."