Disclaimer: See the introduction.

Author's Note: Edited chapter!

Third person POV…

Making it through the corridor, the Doctor, Rose and Sophie went down the metal steps and into Intensive Care. Sophie was in the front so, they missed the smirk on her face, still not knowing she was actually Cassandra. It wasn't that much longer until they found themselves in these huge cavernous chambers, looking upon rows and rows of green doors. Rose wondered what was contained in these doors but she had a feeling that she probably didn't want to know or find out. Unfortunately, she was going to find out whether she liked it or not.

The Doctor walked along one of the rows and used the sonic screwdriver to open up one the doors. The wheel spun around, unlocking the door. The Doctor put up his sonic screwdriver away before pulling the door open.

Rose gasped horrified at the sight of a man covered in boils and surrounded by smoke, looking back at them.

Beside Rose, Sophie's face screwed up in disgust. "That's disgusting," she commented.

Rose still couldn't believe what she was seeing before her. "Doctor, what's wrong with him?" she asked.

The Doctor didn't respond to Rose's question as he was too lost in his own thoughts. "I'm sorry. I'm so sorry." He mumbled to himself, shaking his head sadly.

Sophie held her nose while the Doctor closed the door. This wasn't the only one he looked at. He opened up another. This time, it contained a woman and Sophie stared at her, disgust still written all over her face. The woman looked just as disgusting as the man had.

"What disease is that?" Sophie asked.

The Doctor's voice was quiet and disgusted as he spoke up to answer Sophie's question. "All of them." He whispered lowly. "Every single disease in the galaxy, they've been infected with everything."

"What about us? Are we safe?" Sophie looked worried at the thought of them looking exactly like the people in those pods.

Rose looked at her friend in absolute disbelief. Normally, Sophie would be just as concerned as she was, probably even more so, but here she was just thinking about herself. Now, she was positive that something was up with her best friend.

"The airs sterile, just don't touch them," The Doctor answered quietly as he slowly shut the door and went over to the railing, leaning over it as he looked up the rows of doors with sadden but angry eyes. Rose and Sophie stood right beside him as Rose looked up at him in concern.

"How many patients are there?" Sophie questioned, curiously.

"They're not patients," The Doctor said, trying to suppress the anger he was feeling.

"But they're sick?" Sophie pressed on.

"They were born sick," he responded angrily as he gave up on trying to hide how angry he was. "They're meant to be sick. They exist to be sick. No wonder the Sisters have got a cure for everything. They've built the ultimate research laboratory. A human farm."

"Why don't they just die?"

"Plague carriers. The last to go."

Novice Hame suddenly appeared at the end of the row. "It's for the greater good." She said calmly.

"Novice Hame," The Doctor said coldly. "When you took your vows, did you agree with this?"

"This Sisterhood has sworn to help."

Rose shook her head in disbelief.

The Doctor glared at Novice Hame. "What, by killing!" he yelled.

"They're human beings, they don't deserve this!" Rose added in with her own glare.

Novice Hame shook her head. "No, they're not real people or human beings," she said gently. "They're specifically grown. They have no proper existence."

The Doctor started to advance towards her dangerously with Rose and Sophie following him. "What's the turn over? Hm? A thousand a day? Thousand the next? Thousand the next? How many thousand? For how many years?" When she didn't answer, he yelled, "HOW MANY?!"

"Mankind needed us. They came to this planet with so many illnesses. We couldn't cope. We did… try. 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," The Doctor said, wildly gesturing to the people in the rows of green doors beside them.

Novice Hame still didn't think they were doing anything wrong. It was clear that they were, but they just didn't want to admit it. "But think of those Humans out there … healthy … happy, because of us."

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

"But who are you to decide that?" Novice Hame pressed him.

The Doctor stepped forward, a hard look on his face. "I'm the Doctor. And if you don't like it... if you want to take it to a higher authority, then there isn't one. It stops with me."

Sophie peered over the Doctor's shoulder. "Just to confirm," she started off. "None of the Humans in the city actually know about this?"

"We thought it best—"Novice Hame was cut off by the Doctor.

"Hold on. I can understand the bodies. I can understand your vows but the one thing I can't understand –"

"What have you done to Sophie?" Rose finished off, glaring at Novice Hame, not noticing that Sophie had stiffened up.

"I don't know what you mean," she said slowly.

The Doctor clenched his jaw but he managed to keep a calm look on his face. It had been hard, considering how mad he was. "And I'm being very, very calm," he said deathly quiet. "You want to beware 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 Sophie's head, I want it reversed."

"We haven't done anything."

Still standing behind the Doctor, Sophie spoke up. "I'm perfectly fine…" she said, reassuringly.

"People are dying," The Doctor said to Novice Hame. "And even though I haven't known Sophie for long, I just met her actually, but I know that she would care."

Rose nodded in agreement. "She definitely would."

Cassandra was caught and she knew this, but that didn't mean she had to like it. She rolled her eyes in annoyance.

"Oh, all right, clever clogs." She spun the Doctor around and she pulled his tie out flirtatiously. "Smarty pants." Her voice turned husky as she pushed herself against the Doctor's body, letting their bodies flush together. "Lady-killer."

The Doctor stared at her, trying to ignore her body against his since this wasn't Sophie, as Rose glared at whoever was in Sophie's body. Though she knew that someone had taken over Sophie's body and had been the one to kiss the Doctor, she still got jealous. Who the hell was she?

"What happened to you?" The Doctor questioned Cassandra worriedly. It was worry for Sophie, not for whoever had taken over her body.

Cassandra played with his tie as she smirked and he immediately didn't like the way the smirk looked on Sophie's face. "I knew something was going on in this hospital, but I needed a body. It was going to be Rose Tyler." She sneered in Rose's direction, who glared in response. "But then this one came along, so I decided to use her instead and because of the fact she knew you, I used her body to get your mind, to find it out." Her smirk widened. "And I have to say, it worked out perfectly." Her eyes glanced at the Doctor's lips and he ignored it.

"Who are you?" The Doctor questioned.

Cassandra stood on her tiptoes and she whispered in his ear, but loud enough to where Rose could hear her. "The Last Human."

Rose gaped as the Doctor pulled back and stepped away her, his eyes wide. Cassandra was the one who kissed him!

"Cassandra." Rose managed to say.

"Hello darling," Cassandra purred at Rose. "Oh and I would love for both of you to smell the perfume." She quickly took out the tube of perfume and squirted it at the Doctor first. He immediately keeled over, unconscious.

"Doctor!" Rose cried, horrified.

Before she could run over to him, Cassandra sprayed her in the face as well and she fell over unconscious, near the Doctor.

Novice Hame rushed over to them, kneeling next to the two as she looked up at Cassandra horrified. "You hurt them! I don't understand – I'll have to fetch the Matron!"

"You do that, because I want to see her," Cassandra stated, peering down Novice Hame. "Now run along! Sound the alarm!"

She quickly stood up and hurried off. As soon as she was gone, Cassandra went over to a cable and ripped it off in one quick swipe, causing an alarm to go off. She smiled to herself satisfied. Suddenly, she heard Sophie's voice in her head again, obviously managing to move out of the depths of her mind.

'The Doctor is going to stop you!' She exclaimed, sounding so completely sure. Cassandra couldn't help but roll her eyes.

'We'll see about that darling.'

She pushed Sophie back, but this time, the girl actually tried to put up a fight and was trying to get control of her body. Cassandra wouldn't have that. After fighting the girl for what seemed like forever, she managed to push Sophie back all the way. This left her out of breath and feeling a little bit weak. Cassandra ignored it though as she went to put the Doctor and Rose in a cell. Luckily for her, there were two spare ones, right next to each other. Cassandra smirked to herself. Finally. She would get her revenge.

-0-

The first thing Rose remembered when she woke up had been that Cassandra was in Sophie's body and the Last Human had knocked both her hand the Doctor out. Sitting up, her head hit the ceiling. She muttered a 'ow' before she realized that she was in one of those cell. Rose knocked her fists into the door.

"Let me out Cassandra!" she yelled. However, she didn't get a response and she continued to hit the door, still screaming to get out.

"Will you shut up?" Cassandra in Sophie's body came up to her with a scowl on her face. "I get enough screaming from your friend."

Not knowing what she meant by that or not even caring right now, Rose didn't listen to her. "Let me out of here, Cassandra, and let Sophie go!" she exclaimed.

Cassandra's scowl disappeared and she smirked. "Sorry darling, I can't do that…at least not right now. Now, if you excuse me, I have to talk to the Doctor."

"GET BACK HERE!" Rose had to watch Cassandra walk away but even then, she still hit the door. This time, she hit it with her feet, thinking she could kick it open. Of course it didn't work. As she hit the door one more time, she heard the Doctor's voice and it was nearby, right next to her in fact. Rose let out a shaky breath as she put her feet back on the ground of the cell and listened in on the conversation.

"Let me out! Let me out!" The Doctor yelled.

Then she heard Cassandra's voice. "Aren't you lucky there were two spares?" Rose knew Cassandra was smirking even though she couldn't see it. "Rose is in one too and it's the one right next to you. How convenient?"

"You stole Sophie's body." Rose heard the Doctor accuse Cassandra and she didn't miss the anger in his voice.

'Why does he care about her so much? They just met…' An evil and jealous voice in her head sneered but she ignored it. 'You know it's true Rose...' Again, she ignored the voice. It wasn't true.

"Over the years, I've thought of a thousand ways to kill you, Doctor and your little friend, Rose. And now that's exactly what I've got. One thousand diseases. They pump the patients with a top-up every ten minutes. You and Rose got…" Cassandra paused for a moment. "Three minutes left. Enjoy."

"Just let Sophie go." The Doctor tried pleading with her. "She didn't do anything to you Cassandra. You want revenge on me and Rose, not her. So just let her go."

"I will!"

Rose held her breath, hoping she meant it. That hope went down the tubes at her next words.

"As soon as I've found someone younger and … less common…then I'll just junk her with the waste," she said, putting a heavy emphasis on the words 'waste and junk' almost as if she was baiting the Doctor to get him angry. It worked as Rose heard the Doctor growl and jealousy hit her once more. "Now hushaby! It's show time."

-0-

Cassandra turned to face Matron Casp and Sister Jatt as they approached her.

"Anything we can do to help?" the Sister asked.

Cassandra didn't want to waste time in making conversation with these cats. "Straight to the point, Whiskers… I want money."

"The Sisterhood is a charity, we don't give money," Matron Casp said, almost trying to hold her laughter but failing as if what Cassandra said was a joke. To her, she thought it was. "We only…accept."

Cassandra stared at her. "The Humans across the water pay you a fortune, and that's exactly what I need. A one-off payment. That's all I want…oh and perhaps a yacht." Then for added measure, she threatened them. "In return for which, I shall tell the City nothing of your institutional murder. Is that a deal?"

Sister Jatt started to press a few buttons on the remote she had in her hand, probably calling the police.

"I'm afraid not." Matron Casp responded.

Cassandra glared at her. "I'd advise you to think about this," she threatened again.

"There's no need. I have to decline."

"I'll tell them!" Cassandra tried to think of something else. Once she thought of it, she voiced it out loud in a smug tone of voice. "And you've got no way of stopping me! You're not exactly Nuns with Guns – you're not even armed."

"Who needs guns when we have claws?" Matron Casp's claws shot out from her paw as she lifted it up and hissed at Cassandra menacingly.

She laughed nervously. "Well, nice try." She spun around to face Chip, who was waiting nearby. "Chip! Plan B!"

Knowing exactly what that meant, he pulled on a lever and every cell in the room sprung open. All the infected people were out first and the Doctor and Rose followed right after.

The Doctor's eyes widened in horror, seeing every infected person out of their cages. Then his eyes met Cassandra and anger went through him. "What have you done?!" he yelled at her, enraged.

"Gave the system a shot of adrenaline, just to wake them up. See ya!" Cassandra gave a quick wave and ran off with Chip right there behind her.

"Don't touch them!" The Doctor warned the nurses. "Whatever you do, don't touch! Come on, Rose!" He grabbed his friend's hand and they dashed off after Cassandra and Chip.

They managed to catch up to them just as Cassandra screamed at the top of her lungs, running along the row of doors they ran past. After running for at least a couple of minutes, they paused in their running to watch all the zombies break out of their cells. Rose gasped horrified, gripping onto the Doctor's arm.

"Oh my God," Cassandra said looking just as horrified as Rose. Even though this was all her fault.

"What the hell have you done?" the Doctor demanded as he glared at Cassandra.

"It wasn't me!" she protested.

Rose glared at her too, letting go of the Doctor's arm. "If you hadn't opened those other doors, this wouldn't be happening!" she exclaimed angrily.

Cassandra glared right back at her and opened her mouth to snap at the blonde. But the Doctor spoke up before she could.

"One touch and you get every disease, I want that body safe Cassandra!"

Rose frowned in distaste. Sure she didn't want Sophie to get hurt either but she had a reason too. What was the Doctor's reason? He just met her for god sake! If she wasn't so jealous, then she would realize that the Doctor acted this way with every one of his companions. He never wanted any of them harmed.

"We've gotta go down!" The Doctor said loudly to Cassandra, who looked horrified, seeing the zombies advancing towards them.

"But there's thousands of them!" she whimpered, terrified.

The Doctor didn't have time for this. "RUN!"

Cassandra whimpered again but did as the Doctor said. She ran down the stairs with him and Rose behind her.

"Down! Down! Go down!" he exclaimed as they continued to race down the stairs as fast as they could, hearing Matron Casp calling for quarantine.

They heard the PA, still running down the stairs.

"Repeat – this building is under quarantine. No one may leave the building. Repeat… no one may leave the premises."

Rose looked back and saw that the zombies had followed them down with their arms stretched out towards them.

"Doctor!" she screeched, frightened.

"Keep going! Go down!"

Finally they descended down the last flight of stairs and busted through a door into the cellar that Sophie had come from. Cassandra immediately ran to the lifts. She frantically tried to get them to work. Watching her, the Doctor knew it was no use.

"No, the lifts have closed down," he told her, stopping in his running and Rose stopped beside him. "That's the quarantine, nothing's moving."

"This way!" she cried as she ran in the opposite direction with the Doctor and Rose on her tail.

Looking over his shoulder, the Doctor saw that Chip had been left behind as more infected came spilling out from converging corridors. "Someone will touch him!" He was about to go back and get him, but Cassandra grabbed his arm, stopping him.

"Leave him!" she ordered. "He's just a clone thing, he's only got a half-life – come on!"

"Mistress!" Chip cried pitifully and Rose felt bad for him. But as much as she hated to admit that Cassandra was right, she was completely right. They didn't have the time to go back to him.

Before the Doctor had time to protest, Cassandra was already running in the opposite direction.

"I'm sorry, I can't let her escape!" he called to Chip, before grabbing Rose's hand, tugging her along as they ran after Cassandra.

Looking over her shoulder, Rose saw that the infected people were advancing on him. She closed her eyes tightly before she opened them and looked forward once more.

-0-

Cassandra ran back into the room where she put herself into the girl's body with the Doctor and Rose behind her. She ignored them as she ran to a door that was in the room and she opened it up. She held back a scream, even though she did let out another squeak, when she saw zombies on the other side of the door. Cassandra slammed the door on them, grabbing a nearby chair to barricade the door to keep the zombies from coming in.

"We're trapped!" she cried, upset and scared as she went back over to where Rose and the Doctor were and walked past them. "What are we going to do?" She turned around to face the Doctor and Rose with a terrified look on her face.

"Well, for starters, you're going to leave that body!" The Doctor told her angrily, gesturing to the psychograph with his sonic screw driver. "That psychograph is banned on every civilized planet! You're compressing Sophie to death."

Rose had a look of disbelief on her face. "What?"

Out of nowhere, Cassandra clenched her head, moaning in pain. The girl was trying to break through again!

"What's wrong?" Rose demanded as the Doctor looked on in confusion.

"This stupid girl is once again trying to fight her way through." Cassandra managed to say through gritted teeth. "Your friend is one annoying bitch!"

The Doctor clenched his jaw at that. She was anything but that disgusting word. Cassandra let out a sigh of relief when she was able to push Sophie back. Now, she was able to respond to what the Doctor said.

"I've got nowhere else to go. My original skin's dead."

"Not my problem," The Doctor told her angrily. "You can float as atoms in the air. Now … get … out …" He glared at Cassandra as he pointed his sonic screwdriver at her threateningly. "Give her back to me."

Rose scowled at his words, jealousy coursing through her. She hated being this jealous, but she felt as if she was being pushed to the side to make room for Sophie.

"You asked for it." Cassandra said in response to the Doctor and she let out a breath.

Rose watched with wide eyes as a cloud of light leaped from Sophie's body and into the Doctor. Since Cassandra was gone from her, Sophie felt disoriented and a little off balance.

"Ow, my head!" she moaned.

Rose stepped a step forward tentatively towards her friend. "Sophie?"

Sophie didn't seem to hear Rose as she looked around frantically with an angry look on her face. "Where the hell is that pancake?!"

"Oh my."

At the sound of the Doctor's voice or what sounded like the Doctor, Sophie and Rose whirled around.

"This is different."

Sophie was the first one to realize what happened and her eyes widened. "Cassandra!"

"Cassandra?" Rose said surprised.

But Cassandra didn't seem to hear them. "Goodness me, I'm a man. Yum. So many parts! And hardly used…" She started to wiggle around crazily as Sophie and Rose watched on in disbelief. "Ah…ah! Two hearts! Oh, baby, I'm beating out a samba!"

"Get out of him!" Rose exclaimed.

Cassandra ignored her, stopping the crazy moves she was making with the Doctor's body, as she ran a hand down his body. "Ooh, he's slim. And a little bit foxy." She made the Doctor's eyebrows rise at Sophie. "You thought so too. I've been inside your head…"

Sophie blushed and she sputtered out, missing the glare on Rose's face, "N-N-No I haven't."

"Oh yes you have," Cassandra said as she came closer to Sophie, teasing look on his/her face. "You've been looking … you like it and don't lie; you loved it when I kissed him for you when I was in your body."

Luckily, at least for Sophie, she didn't have time to respond as the zombie people suddenly burst through the doors, the chair flying and hitting the nearest wall, making them both jump including Rose.

"What do we do? What would he do?! The Doctor — what the hell would he do?!" Cassandra cried frantically, gripping onto Sophie's arm since she was closest.

Quickly thinking, Rose spun around and noticed a ladder. "Ladder…we've got to get up." She was about to go first but Cassandra, who had let go of Sophie's arm, pushed her roughly out of the way to get to the ladder first.

"Out of the way Blondie!" she cried as the zombies came even closer.

Sophie was the first to follow hurriedly after Cassandra/the Doctor so she was next up the ladder and Rose was last.

"If you get out of the Doctor's body, he can think of something!" Rose called to Cassandra, annoyed.

She just ignored her again.

Sophie grumbled under her breath before she raised her voice. "Just listen to her Cassandra! Unless you want to get all their diseases!"

"Yap, yap, yap… God, you're even more annoying in real life than in your head! You rambled on and on and kept on trying to get control of your body." Though they couldn't see it, she rolled her, well the Doctor's, eyes.

Rose was getting annoyed again. "We're gonna die if—"She let out a sudden scream as she felt someone grab her ankle. She quickly looked down and saw that Matron Casp was the one who grabbed her. She tried to get her ankle out of her grip as she exclaimed, "Get off!"

"All our good work! All that healing!" the Matron cried.

Cassandra rolled her/his eyes at how pathetic this cat sounded even more so as the cat continued.

"The good name of the Sisterhood – you have destroyed everything!"

"Go, and play with a ball of string," Cassandra said off handedly.

Sophie glared at her. "Just be quiet!" Her glare turned to Matron Casp. "Let go of her!"

The cat ignored her. "Everywhere – disease! This is the Human World. Sickness!"

The zombie people managed to catch up to them and one of them grabbed onto Matron Casp's ankle. She wailed in pain as her face broke out in disgusting boils. When she went to grab her face with both of her hands, her foot slipped and she fell down the shaft, wailing.

Sophie was horrified and shocked at what happened, but she knew it was no use. Once she was gone, the zombie people started to climb up the ladder.

TBC...

In...

New Earth, Part 4...