The Professor groaned as he found himself bound to a rock. He shifted against the tightly bound ropes before looking over and seeing that Clara was tied with him. "What's going on?" he asked, and then he saw Missy sitting opposite them, sharpening a stick.

"How did we get here?" Clara asked before looking over at Missy as well. "Why are we tied up?"

Missy didn't bother to look at them. She still sharpened her stick. "Consider the Doctor," she began. "The Doctor, trapped. The Doctor, alone." She smirked at them. "Oh, this is a lovely story. You'll love it. It's a classic. So, the Doctor, on the run, no TARDIS. No friends, no help. In other words, the Doctor is happy. This was a long time ago. It doesn't matter which face he was wearing. They're all the Doctor to me. So let's give it to the eyebrows, aye?

"He's travelling by teleporter. Unfortunately, his teleporter is out of power. Also unfortunate, he's being stalked by, oh, say, about 50 android assassins? I may be rounding up. Ow!" she pouted as she stabbed herself with the stick she was busy sharpening. "50 invisible, indestructible android assassins, all exclusively programmed to kill him."

"Why do you have that stick?" the Professor asked, his gaze on the stick she was busy sharpening."

"Well, I have no idea how long we will be stuck out here. We might have to go hunting."

"What's on Skaro to hunt?" Clara asked.

"I don't know. But I do have a backup to that," Missy answered.

"Us," the Professor said when realisation sank in.

Missy winked at him. "Correctamundo," she said. "Now, let's continue with the story, shall we? Now, the Doctor is surrounded. He's outnumbered and outgunned. And freeze. Nanoseconds to live. 4, I'd say, being generous. Now, my question is this. How did he survive? Oh, come on!" She looked at the Professor. "You should know him more than anyone."

"The teleporter…" the Professor breathed. "He'd use that."

"Oh, good! Good!" Missy cheered. "He stole that from an android."

"So if he has a teleporter from an android, then he must use the same energy as the androids," the Professor mused. "He would use the energy wave from the android weapons to recharge the teleporter, and at the exact moment he's supposed to disintegrate, he actually teleports. Which is how you survived. How you've always survived, right?"

Missy nodded. "I modified the same principle for our vortex manipulators. Blew them off, I'm afraid. But the Doctor, he improvised it. He must have got through several thousand calculations in the time it takes to fire up a disintegrator. Seriously, what a swot!"

"It isn't hard. Not if you know what you're doing," the Professor added as he used his magic to snap the ropes that bound him and Clara.

"You're beginning to sound like your father," Clara pointed out. "The showing off thing."

"We're all Time Lords, dear," Missy said. "It's what we do. But the question is this: why does the Doctor always survive?"

"Because he's clever," Clara answered. "Really clever."

"And because he assumes he's going to win," the Professor added. "He knows that there is always a way to survive. Because there is always another way."

"Yes," Missy agreed. "Except this time, he made a will and threw himself a goodbye party. Now, if the Doctor assumes he will die, what happens then?"

"We do," Clara said as she and the Professor stood up and looked toward the Dalek city.

"He's trapped at the heart of the Dalek Empire," Missy commented. "He's a prisoner of the creatures who hate him most in the universe. Between him and us is everything the deadliest race in all of history can throw at us. And we, on the other hand, have a pointy stick." She held up the stick she had been sharpening.

"And magic," the Professor added.

Missy sighed. "Well, that too. No, how do we start?"

"By assuming that we will win."

The three looked at the Dalek city from a safe distance, watching as the Daleks flew around. "Exterminate the Doctor! Exterminate!" they chanted.

"What's happening?" Clara asked.

"Dad's in there," the Professor said. "Right in the middle of that. We need to help him."

"Ah, that's what we need." Missy looked around and spotted a cave hidden among the rocks a short distance away.

The Professor looked over at the Time Lady before following to see what she was looking at, and Clara followed him. "What are you looking at?" she asked.

"Sewers," Missy answered. "There's sewers through here that will take us right under the Dalek city." Then, she entered the cave and walked through it.

"Daleks have sewers?" Clara asked as she and the Professor followed.

The Professor nodded. "Yep. But with one difference. They're alive. This is where older Dalek mutants go when they're no longer needed."

Missy stopped at a hole that led right directly to the sewers. "How much of a drop would you say that is?"

The Professor peered down into it. "well, I suppose there's only one way to find out," he told Missy. Then, taking hold of Clara's hand, he engulfed the two in a whirl of blue smoke and poofed them down to the bottom.

Missy sighed. "I should have known they would do that," she muttered.

Missy jumped down after them, and then she gathered herself. Brushing some dust off her purple dress, she looked over at them. "What happened to working together?" she asked.

"When have you ever wanted to work together, though?" the Professor asked back. "You've always had your own agenda."

Missy smiled at the comment. "True. But down here, you need me. You won't survive down here by yourself. Now, look around. Bit of a mess, isn't it?"

"It's a Dalek sewer," the Professor said. "What did you expect?"

Before Missy could answer, they looked up as they could hear the Doctor speak across the city above them.

"I want the Professor and Clara safe, alive, and returned to me immediately. You bring them back. You do that. You do that now. I want them unharmed, unhurt and alive."

"Your family…" the Supreme Dalek began.

"I saw what happened," the Doctor interrupted. "I was there. And I'm hoping that it was a trick for all of our sakes."

"It was not a deception."

"Because if they are really dead, then you'd better be very careful how you tell me."

"Listen to that," Missy remarked quietly. "The Doctor without hope."

"Who's going to tell me? Who's going to go first?"

"Nobody is safe now."

"All the power Davros had is mine. Everything he had, I have. Now, who's going to tell me that they are really dead?"

"He'll burn everything," Missy breathed. "Us too."

"Then we need to reach him," the Professor said. "Safely. I assume that you led us to the sewers for a reason?"

Missy nodded. She headed down to the far end of the sewer. She looked into a metal circle with a blue dot that stood out on the wall. Allowing the Daleks a good look at her, she stepped back.

"Intruder alert!" a Dalek shouted, coming down in the lift at the end of the corridor. "Intruder alert!" Humanoid detected in lower level. Dalek to Lower Level 13."

"Did she just call the Daleks down here?" Clara asked.

"We need to trap and kill a Dalek," Missy told her as she took her brooch off. She looked at it carefully and smiled to herself. "Dark star alloy goes through armour plating like a knife through people. It's pretty, though, isn't it? Got it in the olden days of Gallifrey, when the Doctor gave it to me when my daughter …."

"Your daughter?" the Professor asked, but a Dalek entered the sewers and exited the lift.

Missy turned to the Professor and Clara. "Hush. Hide. I've got this."

The Professor pulled Clara towards the sides, watching as the Dalek approached Missy.

"Humanoid detected," the Dalek stated. "Reman still. Do not move. Scan in progress. Humanoid unauthorised in restricted area. Sterilisation proceeding. Alert! Scans register the female as a Time Lord."

"Time Lady, thank you," Missy corrected. "Some of us can afford the upgrade. I'm one that you should fear." She darted forward and poked the Dalek with her brooch. "Because I just put a hole in you." Then repeatedly stabbed the Dalek with it. "And another. And another. And another."

"What are you doing?" Clara asked in a whisper.

"Murdering a Dalek," Missy answered. "All part of my plan, my dear."

"Damage levels insignificant," the Dalek stated.

"Oh, really?" Missy smirked. "I think you're forgetting you're surrounded by a bunch of very old, angry Daleks." The decaying Daleks began to screech as Missy imitated an American accent, "You just got yourself a puncture in a bad neighbourhood. Meet the locals? All blind and squelchy and out of their tiny minds, but they can still smell! Nobody hates like a Dalek. Here they come! I think they want to steal your motor."

Brown goo seeped out of the cave's walls and surrounded the Dalek. It crept up the shell and seeped into the case.

"Emergency! Emergency! My vision is impaired. Exterminate! Exterminate!"

"Here comes the old generation," Missy exclaimed as the Dalek fired shots around. She took hold of the Professor and Clara, pulling them around the corner as the Dalek exploded. "Weee!" she squealed in delight.

The Professor approached the Dalek, opened the lid and pulled out the Dalek mutant before throwing it to the other side of the cave. Clara watched him with disgust. "Are you sure this will work?"

"I don't know," the Professor said. "It's all part of Missy's plan. Where is she, anyway?" He hadn't seen her for the past few minutes. But then, he felt something whack him from behind the head, and he fell unconscious.

Clara rushed to him before looking up at Missy. "What did you do that for?"

"For motivation," Missy answered.

"Motivation for what?"

Missy gestured to the empty Dalek case. "Get in. I promise no harm will come to your beloved Professor if you get in."

Sighing, Clara entered the Dalek casing. Missy connected her quickly while holding her down if she tried fighting back. She smiled at her handiwork before locking her inside and teaching her the basic commands for controlling the Dalek case.

Missy leaned closer. "Are you okay in there?" she asked.

"Fine, I think," Clara said, but she was taken aback by the voice that came out. A Dalek's voice. "Okay. That's a bit weird."

Missy chuckled. "Just a bit. Okay. All right. Shh. Say your name."

"Why?"

"Just … Just say it."

"Clara," Clara said, but it came out of the Dalek as "Dalek."

"Say it again."

"Clara Oswald," Clara answered, but again, Missy heard it as "Dalek. Dalek."

"One more time," Missy ordered with delight.

"I am Clara Oswald," Clara said, but again, Missy heard it as, "I am a Dalek! I am a Dalek!"

Missy smiled in amusement before having to dodge fire from the Dalek case. "Alright. Don't get emotional. Emotion fires the gun. Okay?"

"I don't understand," Clara said.

"Say 'I love you'," Missy said. "Those exact words. Don't ask me why. Just say it."

"I love you," Clara said, but it came out of the Dalek as, "Exterminate!"

Missy cackled. "Say, 'You are different from me'."

"You are different from me," Clara repeated, but it came out of the Dalek as, "Exterminate!"

"Say, 'Exterminate'."

"Exterminate," Clara repeated before the gun fired a series of energy bolts that a laughing Missy had to dodge.

"Cybermen suppress emotion. Daleks channel it through a gun. That's why they keep yelling 'exterminate'. It's how they reload. So, let's go and kill them. Come on." She swivelled the Dalek in the right direction, giving it a shove, forcing Clara to control the Dalek, wheeling in front of her.

"Halt! Report."

Once Missy and Clara had reached the main halls of the Dalek city, another Dalek stopped them.

"Humanoid intruder found on lower levels," Clara said, repeating what she had heard from the Dalek in the sewers.

"Why have the intruders not been exterminated? Explain. Explain. Explain!"

Clara froze, not knowing what to say.

"I'm a prisoner of special significance," Missy said. "Count the hearts."

The Dalek quickly scanned Missy. "You are a Time Lord."

Missy sighed. "Time Lady," she corrected. "Is it still the same old Supreme Dalek these days? I fought him once on the slopes of the netherworld. Tell him the bitch is back."

The Dalek escorted them back into the main room with the Supreme Dalek and the other Daleks still there.

"Oh, hello!" Missy giggled as she swirled around the room, ending up next to the Supreme, "Look at you all, with your nice, shiny domes. Oh, I am loving this." She leaned to whisper to the Supreme Dalek. "You're my secret favourite. Don't tell the others."

"You are enemies of the Daleks," the Supreme Dalek stated.

"Yes, well, anyone who's not a Dalek is an enemy of the Daleks, so that was an easy guess."

"You will be exterminated."

"Please do because I have been on my feet all day." Missy groaned, taking a seat on the dais the Supreme was on. "But before you get all exterminate-y, two things. One, I want to see Davros. Two, I have a lovely little gift for you if you take me to him right now."

"We do not negotiate."

"Clara Oswald. I've brought you complete control of the Doctor, gift-wrapped. Better. Canned."

"Where is Clara Oswald?" the Supreme Dalek demanded. "You will tell us! You will tell us! You will tell us."

Missy smiled, beginning to dance and swirl in tune to the Dalek when they all suddenly stopped, powering down. She stopped, glancing around the room, "I'm sorry. Was I, um, was I boring you?"

Then, a familiar golden energy began rising from the Daleks. "No. No, no, no, no, Doctor. What have you done?"

"What's happening?" Clara asked.

"I have to find the Doctor," Missy said as she ran across the room to one of the doors.

Clara watched as Missy ran off, and she tried to follow. "No! No!" she said, but it came out of the Dalek as, "Exterminate!"

"You can't just leave me here!" Clara called out, but Missy couldn't hear her anymore.

She ran through the corridors, pulling a Dalek gun off one of the dormant, regenerating Daleks and using it to break open the lock.

Missy entered Davros's medical room, where she saw Colony Sarf's snakes trapping the Doctor amidst a coil of wires, with regeneration energy seeping into it. She then fired the Dalek gun at the snakes, causing their grip on the Doctor to release, and the Doctor collapsed to the ground.

"Morning," Missy said as she tapped the Doctor's cheek, and he slowly awakened.

The Doctor sat up and saw Missy. "Where are they?" he asked of the Professor and Clara.

"Oh, hello to you, too," Missy replied.

"You're alive, so they are too. Where are they?"

"I'm fine. Thanks for asking."

"Oh, you are not fine," Davros said. "Thanks to you, Doctor, my creatures shall grow to another greater supremacy. And my own life is prolonged. This is the final defeat of the Time Lords. Have you nothing to say, Doctor?"

"Three," the Doctor said, and he raced over and grabbed his confession dial.

"Do you understand what has happened? Hear my children sing."

"Two," the Doctor said.

"Oh, I know that face," Missy commented, observing the Doctor.

"All praise Davros, creator and saviour of the Daleks," Davros stated.

"One," the Doctor said, and the city began to shake.

"What is that?" Davros demanded. "What's happening?"

"I knew exactly what you were doing, and I let you do it. You transmitted regeneration energy into every Dalek on this planet. Every single one."

"What have you done?"

"One word. No, two words, actually. Uh, first word … Moron," the Doctor said, and Missy snickered. "Second word, sewers," the Doctor repeated.

"No. This cannot be correct. How can this be?" Davros asked as he looked around.

GGenerations of Daleks just woke up very cross, and they are coming up the pipes. Or, to put it another way, bye!" The Doctor turned and ran out of the room.

"No, you must help me." Davros pleaded.

"Can I just say it's been an absolute pleasure to finally meet you?" Missy curtsied at Davros, holding her hand as if to shake his before she poked his blue eye. Well, she did say she'd scratch his eye out. She turned to follow the Doctor.

The Doctor raced through the corridors until he was stopped by a Dalek approaching him. The Dalek that Clara was inside.

"Doctor!" Clara began.

"This city is about to be sucked into the ground," the Doctor said. "Your own sewer is about to consume you. There's no way you can win. There is nothing you can do. So tell me, where are Clara Oswald and the Professor?"

"I am Clara," Clara said, but it came out as "I am a Dalek!"

"Yes, you're a Dalek. But where is my family?"

"Right here," said a voice behind the Doctor. He turned around and saw the Professor approach him.

The Doctor hugged him. "But where's Clara?"

The Professor pointed at the Dalek. "Right there," he said, grabbing his sonic screwdriver out of his coat pocket and aiming it at the Dalek. Giving the device a whir, the Dalek case opened, revealing Clara inside. The Professor raced forward, placing his hands on both sides of Clara's face.

The Doctor looked at her. "Why is she in there? What happened to you guys?" he asked just as Missy arrived.

"Ask her," the Professor said, gesturing to Missy. "She tied us to a rock. Then, hit me over the head and placed Clara inside this Dalek."

"Missy," the Doctor glared at her. "Run."

"Don't you see?" Missy asked. "The friend inside the enemy. The enemy inside the friend. Everyone's a bit of both. Everyone's a hybrid."

"I said run!" the Doctor said again.

"It wasn't me who ran, Doctor. That was always you." Missy lifted her chin as she turned and walked away.

The Doctor, the Professor and Clara raced back to the central control room of the Dalek city, watching as the Dalek mutants from the sewers attacked the Daleks and weakened the city.

"Where was the TARDIS?" the Doctor asked the Professor and Clara, looking around the room. "It was over there somewhere, wasn't it?" He pointed to the far side of the room.

"What is happening?" the Supreme Dalek demanded. "Explain! Explain!"

"Dalek Supreme, your sewers are revolting."

"You will assist, or you will be exterminated."

"Ah, well, go on then," the Doctor said. Exterminate away!"

"Doctor!" Clara gasped just as the Daleks fired at them, only to hit an invisible wall.

"The TARDIS force field is still here," the Professor said. "We get in, but you guys don't."

"The TARDIS has been destroyed," the Supreme Dalek said.

"Ah, don't be silly. But, of course, it hasn't," the Doctor waved it off. "It's just redistributed itself for a moment. Hostile Action Dispersal System. I'll give it a quick blast from my sonic, and the real-time envelope will reassemble right here."

"Doctor, you don't have your screwdriver." Clara reminded him.

"Oh, yeah, I'm over screwdrivers. They spoil the line of your jacket. These days, I'm all about wearable technology." He grinned as he put on a pair of black sunglasses.

"No!" Clara gasped. "No? Seriously?"

"He always is," the Professor said with a smile as the Doctor activated the sunglasses, and the TARDIS reformed around the trio.

"What is happening?" the Supreme Dalek asked.

"Ah, same old, same old," the Doctor said with a smile. "Just the Doctor, the Professor and Clara Oswald in the TARDIS."

"And that'll never change," the Professor said, as he took Clara's arm, watching as the Doctor hurried to the console and they dematerialised.