Cass-Rose stuffed The Doctor, Nova, and Tate all inside individual cells. The three of them had regained consciousness after being spritzed in the face with knockout perfume. Nova was the first to open her eyes and notice that they were trapped. The Doctor was to her left, and Tate was to her right. Cass-Rose walked up to Nova's cell. Chip was with her.

"Alright Cassandra," Nova began, narrowing her eyes at her friend's possessed body. "You'll let us out right now or you'll regret it"

Cass-Rose let out a laugh. " Aren't you lucky there were spares? Standing room only"

It was The Doctor's turn to speak. "You've stolen Rose's body!"

Cass-Rose stepped in front of his cell. She put her arm up on the glass and leaned against it "Over the years, I've thought of a thousand ways to kill you, Doctor" She smirked, and looked over at the other two. "And I might as well kill your new girlfriend, and your other friend too" Her attention went back to the 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 all got about three minutes left. Enjoy"

"Let Rose go, Cassandra" The Doctor pleaded.

"I will. As soon as I've found someone younger, and less common, then I'll junk her with the waste" Cass-Rose stood in front of Nova's cell once again. She crossed her arms, and eyed the woman up and down. "Or I might keep you alive after all, and just take your body. I could go far with a pretty face like yours. Now hushaby. It's showtime"

"No!" Tate screamed. He began banging his fist against the glass. "You're not having her!"

"Leave Nova alone!" The Doctor also begged.

Before Cass-Rose could do anything, Jatt and Casp approached. "Anything we can do to help?" Jatt asked.

"Straight to the point, Whiskers. I want money" Cass-Rose demanded.

"The Sisterhood is a charity" Casp told her. "We don't give money. We only accept"

"The humans across the water pay you a fortune, and that's exactly what I need" Cass-Rose took steps closer to Jatt and Casp. "A one-off payment, that's all I want. Oh, and perhaps a yacht. In return for which, I shall tell the city nothing of your institutional murder. Is that a deal?"

"I'm afraid not"

"I'd really advise you to think about this"

"Oh, there's no need. I have to decline"

"I'll tell them!" Cass-Rose threatened, raising the volume of her voice. "And you've no way of stopping me. You're not exactly Nuns with Guns. You're not even armed"

"Who needs arms when we have claws?" Casp unsheathed her claws. The poked through the gloves she was wearing. She also growled at Cass-Rose.

"Well, nice try" Cass-Rose turned to look at Chip. "Chip? Plan B"

Chip pulled back a lever which opened all the cells. The Doctor, Nova, and Tate stepped out of the cells, as well as all the sick people. The Doctor and Nova looked at Cass-Rose, then to all the sick people. At the same time, they exclaimed, "What have you done?"

"Gave the system a shot of adrenaline, just to wake them up. See you!" Cass-Rose and Chip ran off.

"Don't touch them!" The Doctor warned Jatt and Casp. "Whatever you do, don't touch!" He, Nova, and Tate ran off after Cass-Rose and Chip. 

The five of them made it to a higher walkway where they saw that every single cell door had been opened. "Look what you did, Cassandra" Nova chastised.

"It wasn't me!" Cass-Rose retorted.

"Well, it definitely wasn't the Easter Bunny" Tate sassed her.

"One touch and you get every disease in the world, and I want that body safe, Cassandra" The Doctor looked at her, and then to Nova and Tate. "And I want your bodies safe as well"

"There's only one way to go, and that's down" Nova decided.

"But there's thousands of them!" Cass-Rose cried.

"Then you better start running, body snatcher!" Tate urged her, even giving her a slight push in the direction of the stairs. The Doctor, Nova, Tate, Cass-Rose, and Chip all started running down the stairs.

______

They eventually made it down back into the basement. Cass-Rose tried the lift. " No, the lifts have closed down" The Doctor said. "That's the quarantine. Nothing's moving"

"This way!" Cass-Rose shrieked as she started running in the opposite direction. Everyone else followed after her. Chip got stuck behind a group of sick people. Nova stopped when she saw that he was trapped.

"Someone's gonna touch him!" she wallowed.

"Leave him!" Cass-Rose said. She grabbed Nova's arm and pulled her away. "He's just a clone thing. He's only got a half life. Come on!"

"Mistress!" Chip pleaded.

The Doctor looked back at him. "I'm sorry. We can't let her escape" 

______

The now group of four made it to a back room. Cass-Rose tried opening a door at the back of the room, but more sick people were on the outside. She gasped, and quickly closed the door. "We're trapped!" she wailed. "What are we going to do?"

"Well, for starters, you're going to leave that body. That psychograft is banned on every civilised planet. You're compressing Rose to death" The Doctor said.

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

"Not my problem. You can float as atoms in the air" The Doctor raised his sonic screwdriver and pointed it at Cass-Rose. "Now get out. Give her back to us, and don't you even think about going into Nova or Tate's body"

"You asked for it" Cass-Rose took a deep breath and expelled energy from her body which ended up going inside The Doctor.

"Blimey, my head" Rose was back to normal. Tate went over to. He placed a hand on her shoulder. 

"Are you okay?" he asked.

"Yeah, I'm fine" Rose looked around. "Where'd she go?"

"Oh, my" The Doctor muttered. "This is different"

"Oh no" Nova mumbled, squeezing her eyes shut and pinching the bridge of her nose. "Cassandra, you went into The Doctor, didn't you?"

"Well, I would've went in yours, but he insisted otherwise" Cass-Doctor smirked at her. "Goodness me, I'm a man. Yum. So many parts. And hardly used" Cass-Doctor's body started jerking about. "Oh, oh, two hearts! Oh, baby, I'm beating out a samba!"

"Get out of him!" Nova warned.

"Oo, he's slim, and a little bit foxy" Cass-Doctor raised his eyebrows at her. "He thinks you're foxy too" Cass-Doctor approached Nova. "He's been looking at you. And I can see it on your face. You've been looking at him too. You like him" The diseased people burst in. " What do we do? What would he do? The Doctor, what the hell would he do?"

"Ladder" Rose spoke up. "We've got to get up!"

"Good thinking, Rose" Nova said. 

Cass-Doctor pushed Nova and Rose out of the way. "Out of the way, blondies!" He started climbing up the ladder. Nova managed to catch her balance, but Rose fell over. Luckily, Tate caught her before she hit the ground.

"Thanks" Rose muttered to him, a small grin on her face.

"Anytime" Tate returned the grin. "Now to the ladder"

Nova began climbing up the ladder, followed by Rose and then Tate. As they climbed, Rose started talking to Cassandra. "If you get out of the Doctor's body, he can think of something. He can put his mind to work with Nova's"

"Yap, yap, yap. God, it was tedious inside your head. Hormone city" Cass-Doctor complained. "Besides, why can't she just think of something? She's smart enough"

"You're the one in the front" Nova sassed.

"We're going to die if--" Rose was cut off by Tate letting out a frightened yelp. "Tate! Are you alright?" She asked, looking down at him.

"I'm in a situation here!" Tate referred to the fact that Casp was climbing with them and grabbing onto his ankle. "Let me go!" He tried kicking his foot out of the cat's grasp.

"All our good work. All that healing. The good name of the Sisterhood. You have destroyed everything" Casp said.

"Go and play with a ball of string" Cass-Doctor said. He had stopped climbing.

"Everywhere, disease. This is the human world. Sickness!" A diseased hand touched Casp's ankle. She started becoming diseased herself. She fell of the ladder, screaming until she hit the ground. The diseased people were coming closer to Tate.

"Move!" Rose urged Cass-Doctor. "Or else they'll touch Tate!"

Cass-Doctor screeched and started climbing again. The other three followed suit. They made it up to a door but it was sealed shut. Cass-Doctor tried opening it. Rose and Tate both looked down to see a single diseased woman coming closer. "Now what do we do?" Cass-Doctor asked.

"Use the sonic screwdriver"

Cass-Doctor pulled the sonic screwdriver out of his pocket. He held it like it was dirty. "You mean this thing?"

"Yes, I mean that thing"

"You have one" Cass-Doctor said to Nova. "Why can't you use yours?"

Nova scowled at him. "You're closer to the door"

"Well, I don't know how. That Doctor's hidden away all his thoughts. Well, the thoughts that aren't about you, anyway"

"Cassandra, go back into me" Rose offered. "The Doctor can open it" Nova looked down at Rose, raising her eyebrows, almost like she was saying "are you serious?" Rose noticed. "It's fine, Nova" She spoke to Cass-Doctor again. "Do it!"

"Hold on tight" 

The energy left The Doctor and went back into Rose. "Oh, chavtastic again" Cass-Rose muttered. "Open it!"

"Not till you get out of her!" The Doctor said.

"We need the Doctor"

"I order you to leave her"

The energy left Rose and this time it went into Nova. "No matter how difficult the situation, there is no need to shout" Cass-Nova complained, rolling her eyes at The Doctor. She then smiled, finally realizing where she was. "Oh, I like this body! She's got two hearts as well!"

"I didn't mean to go into Nova!" 

"Where else am I supposed to go?" Cass-Nova pouted. "If I go in you, they tell me to get out" Cass-Nova looked down at Rose. "I'm not allowed to stay in you. The only other option is pretty boy"

"You're not going into Tate either!" Rose said.

"Just do something, Cassandra" Tate shouted anxiously. "They're getting closer" He pointed at the diseased people getting closer and closer.

Cass-Nova crinkled her face in disgust. "Oh, I am so going to regret this" 

The energy left Nova and transferred to the diseased woman in front of the others. Immediately, she started complaining. "Oh, sweet Lord. I look disgusting" 

The Doctor got the door open. He, Nova, Rose, and Tate went through it. Before The Doctor closed the door, Cassandra managed to transfer her energy back into Nova. She fell to the ground and then sat against the wall. "That was your last warning, Cassandra!" The Doctor said.

Cass-Nova just stared at the ground as she spoke. "Inside her head. They're so alone. They keep reaching out, just to hold us. All their lives and they've never been touched" The Doctor offered his hand. Cass-Nova grabbed it, and he pulled her up. 

"We should keep going" Tate suggested. "See if there are others that are safe"

"Tate's right" Rose agreed. They began making their way back to Ward 26.

______

As soon as they reached Ward 26, Clovis charged at them with a metal stand. They all stepped back and put up their hands as the Doctor spoke to her. "We're safe! We're safe! We're safe! We're clean! We're clean! Look, look"

"Show me your skin!" Clovis demanded.

"Look, clean" The Doctor assured as the four of them presented their hands. "If we'd been touched, we'd be dead. So how's it going up here? What's the status?"

"There's nothing but silence from the other wards. I think we're the only ones left. And I've been trying to override the quarantine. If I can trip a signal over to New New York, they can send a private executive squad"

"You can't do that" The Doctor shook his head. "If they forced entry, they'd break quarantine"

"I am not dying in here"

"We can't let a single particle of disease get out. There is ten million people in that city. They'd all be at risk. Now, turn that off!"

"I'd listen to The Doctor if I were you" Rose added.

"Nova would be saying the same thing" Tate crossed his arms and let his eyes wander over to his possessed best friend. "If she had control over her body, that is"

"I'm not turning it off!" Clovis said. "Not if it gets me out"

"All right, fine. So I have to stop you lot as well. Suits me. Rose, Tate, Nova, novice Hame, everyone!" The Doctor requested everyone's attention. "Excuse me, your Grace. Get me intravenous solutions for every single disease. Move it!" Everyone started grabbing the drip bags while the Doctor collected a long piece of heavy silk rope. He tied it around his body. Cass-Nova, Rose, and Tate came over and helped him connect the drip bags to him. "How's that? Will it do?" The Doctor asked.

"I don't know. Will it do for what?" Cass-Nova asked. The Doctor went over to the lift and opened the door. He had a pulley wheel with him. "The lifts aren't working"

"Not moving. Different thing" The Doctor took a few steps back from the lift. He slid his arm through the pulley wheel and put his sonic screwdriver between his teeth. He towards the lift, leaping and grabbing onto the lift cable. 

Cass-Nova peaked her head in. "What do you think you're doing?"

"I'm going down!" He responded. "Come on"

Cass-Nova let out a laugh. "Not in a million years"

"I need another pair of hands"

"Why don't you ask Rose or pretty boy to go with you?"

"If you're so desperate to stay alive, why don't you live a little?" The Doctor dared her. 

"Besides, you're in Nova's body, and if she was in control of it, she wouldn't hesitate"

"Seal the door!" Clovis said. She sealed the door, leaving Cass-Nova and The Doctor trapped with the approaching disease. Cass-Nova had no choice but to jump and grab on to the Doctor.

"You're completely mad!" Cass-Nova commented. "I can see why she likes you. In fact, she's just as mad as you are"

The Doctor attached the pulley wheel to the cable. "Going down!" The two of them zipped down the cable. He put on the brakes before they could come crashing to the top of the lift. They came to a gentle stop.

Cass-Nova gasped, her chest heaving up and down. "Well, that's one way to lose weight"

"Now, listen" The Doctor said to her. "When I say so, take hold of that lever"

"There's still a quarantine down there, we can't--"

"Hold that lever! I'm cooking up a cocktail. I know a bit about medicine myself" Cass-Nova kneeled down and gripped the lever. The Doctor began pouring the contents of the drip bags into the disinfectant tank. "Now, that lever's going to resist. But keep it in position. Hold onto it with everything you've got"

"What about you?"

"I've got an appointment. The Doctor is in" He dropped down into the lift. He used his sonic screwdriver to open the lift doors. The diseased people turned to look at him. "I'm in here! Come on!" He coaxed them.

"Don't tell them!" Cass-Nova chastised him in a grated voice.

"Pull that lever!" The Doctor said. The diseased people started approaching the lift. The Doctor kept on coaxing them. "Come and get me. Come on! Hurry up! Come on!" Cass-Nova pulled the lever. Disinfectant started pouring and spraying into the lift. Some of the diseased people went into the lift and got drenched in the disinfectant. "All they want to do is pass it on. Pass it on!"

"Pass on what!?"

"Pass it on!" The disinfected humans started touching the diseased humans. In a matter of time, they were no longer diseased. The Doctor helped Cass-Nova into the lift.

"What did they pass on?" she wondered. "Did you kill them? All of them?"

"No. That's your way of doing things" The Doctor and Cass-Nova walked out of the lift. " I'm the Doctor, and I cured them" A woman came up and hugged the Doctor. "That's right. Hey, there we go, sweetheart. Go to him. Go on, that's it. That's it. It's a new sub-species, Cassandra. A brand new form of life. New humans! Look at them. Look! Grown by cats, kept in the dark, fed by tubes, but completely, completely alive. You can't deny them, because you helped create them. The human race just keeps on going, keeps on changing. Life will out! Ha!"

______

The Doctor and Cass-Nova went back to Ward 26 where Rose and Tate were anxiously waiting for them. The NNYPD was also there to arrest all the hospital staff. When Rose and Tate saw that they returned, they ran up to them. 

"You're back!" Rose cheered. She looked The Doctor up and down. "And you're wet"

"You did it!" Tate smiled. "You cured them all!"

An announcement was made out about visitors making statements to the NNYPD. That made The Doctor remember something. "The Face of Boe!" They all ran over to the area of the ward where the Face of Boe was. The Face of Boe seemed to be much more alive than he was when they first arrived. "You were supposed to be dying"

"There are better things to do today. Dying can wait" The Face of Boe spoke telepathically to the four of them. 

"Oh, I hate telepathy" Cass-Nova complained. "Just what I need, a head full of big face" The Doctor shushed her. 

The Face of Boe continued. "I have grown tired with the universe, Doctor, but you have taught me to look at it anew"

"There are legends, you know," The Doctor stepped in front of the Face of Boe and lowered himself. "Saying that you're millions of years old"

"There are? That would be impossible"

"Wouldn't it just? I got the impression there was something you wanted to tell me"

"A great secret"

"So the legend says"

"It can wait"

"Oh, does it have to?"

"We shall meet again, Doctor, for the third time, for the last time, and the truth shall be told. Until that day" The Face of Boe beamed away.

"That is enigmatic" He nodded in approval. "That, that is, that is textbook enigmatic"

"That was amazing" Tate added. Rose looked at him, smiling and nodding in agreement.

The Doctor stood back up and looked to Cass-Nova. "And now for you"

Cass-Nova took a step back and folded her arms over her chest. "But everything's happy. Everything's fine. Can't you just leave me?"

"You've lived long enough. Leave that body and end it, Cassandra"

"I don't want to die!" She started crying.

"No one does"

"Help me!"

"I can't!"

"Mistress!" Cass-Nova gasped in surprise when she saw Chip approach.

"Oh, you're alive!" Cass-Nova gleefully cried.

"I kept myself safe for you, mistress."

"A body. And not just that, a volunteer"

"Don't you dare. He's got a life of his own!" The Doctor said.

"I worship the mistress!" Chip said, looking at the Doctor. Cass-Nova winked. Chip looked back at her. "I welcome her"

"You can't, Cassandra--" The Doctor tried to stop her, but the energy left Nova's body and went into Chip's. Nova collapsed in the Doctor's arms. "You alright?" he asked her. He tried letting her go, but she nearly fell again. The Doctor caught her again, and held her close to him.

"Yeah" Nova rasped. She and The Doctor locked eyes again. They just stared at each other again. Rose and Tate both gave knowing smirks to each other. Nova smiled at The Doctor. She whispered only loud enough for him to hear her. "Hello"

The Doctor returned the smile. "Hello. Welcome back, Supernova" He couldn't help but get lost in her eyes. They were the most beautiful shade of blue that he's ever seen. "You've got..." He trailed off. She was making his two hearts beat hard against his chest.

"I've got what?" 

"Oh, sweet lord" Cass-Chip spoke up. The Doctor and Nova stepped away from each other. Cass-Chip held up his arms. "I'm a walking doodle"

"You can't stay in there. I'm sorry, Cassandra, but that's not fair" The Doctor scolded her. "I can take you to the city. They can build you a skin tank and you can stand trial for what you've done"

"Well, that would be rather dramatic. Possibly my finest hour, and certainly my finest hat, but I'm afraid we don't have time. Poor little Chip is only a half-life, and he's been through so much. His heart is racing so. He's failing. I don't think he's going to last---" Cass-Chip collapsed. The Doctor and Nova caught him before he could fall to the ground.

"Are you alright?" Nova asked, genuinely concerned for Cassandra, no matter how much she was mad at her for invading her body and her personal thoughts.

"I'm dying" Cass-Chip realized. "But that's fine"

"I can take you to the city" The Doctor offered.

"No, you won't. Everything's new on this planet. There's no place for Chip and me any more. You're right, Doctor. It's time to die, and that's good"

"Come on" The Doctor said as he and Nova helped Cass-Chip stand up. "There's one last thing I can do"

______

Nova and Tate waited in her TARDIS while The Doctor and Rose were with Cassandra. Tate sat in one of the chairs while Nova walked in circles around the console. The Doctor said that he and Rose would only be five minutes.

"What are you thinking, Nova?" Tate asked. He knew she only wandered aimlessly when she was thinking about something.

"I've found him" Nova smiled. "I've found another like me. Oh, Tatum," Nova spoke her friend's full name as she approached him. She pulled him into a hug. "I never thought I would. I thought it was just me left" She ended the hug but kept a hold on his shoulders. "I'm not alone anymore"

Tate smiled. "And I'm happy for you, Nova, I really am. But what are we gonna do now? Are we going to travel with him and Rose for a while?"

"Of course!" Nova threw her hands up in excitement. "Why wouldn't we? Well..." She put her hands on her hips. She began pacing back and forth. "Maybe a few reasons. We should only use one TARDIS. Attracts less unwanted attention that way. Perhaps we could alternate between them" Now she was just rambling to herself. "Oh! And then there's--"

"Nova!" Tate made her stop pacing. "What about that very important task we were giving by our very important friends?"

"Right, that" Nova walked over to the console. She started began typing. "I haven't found any of the others. I only know of the one, and he refuses to give it to us, no matter how much I tell him it would be safer with us"

Tate nodded, knowing exactly who she was talking about. "Yeah, he is a very stubborn man. But he's quite good at magic tricks. Should we tell The Doctor and Rose about it? Maybe they could help us"

"They can't know. Not yet" Nova shook her head. "Not until I learn more about another one's location" She heard the familiar whirring of a TARDIS. "Speaking of The Doctor and Rose, our new friend's have returned" Nova and Tate stepped out just in time to see the blue box materialise. The Doctor and Rose stepped out. "How'd it go?"

"She's gone" The Doctor said. Nova saddened at the news. Sure Cassandra was a bitch but she never wished death upon her. 

"The Doctor and I have been thinking something over" Rose started, not being able to help the smile on her face. "We would love it if you two travelled with us"

"Really?" Tate piped up. "Nova and I were discussing the same thing"

"Yay!" Rose jumped for joy. "What do you say, Nova?"

Nova looked to The Doctor who was watching her intently with a smile on his face. She grinned back at him. "We'd be honoured, Doctor and Rose Tyler"

"Great!" Rose cheered again. "Whose TARDIS are we taking? Doctor's or Nova's?"

"I'd fancy a trip in the blue box first" Nova decided. Then she looked back at her TARDIS. "But I've got to park Baby first. She's got her own special parking spot"