Following the backlash of the Doctor who episode titled "Death in Heaven", I thought I'd rewrite it, given that it had a very good setup with Dark Water. You're welcome.
Death in Heaven
The Doctor couldn't have imagined it being any worse. Here he stood, next to his arch-nemesis, Missy - who just so happened to be his prior arch-nemesis, the Master. Whilst he stood staring at the Cybermen pouring out of St Paul's, passers-by stopped to take photos and film themselves in front of the metal monsters. How naive this generation was - he'd saved Earth from the Cybermen in the past, but that was only his past. This current 'future', or the people of this moment in time, had not been told of the dangers of the Cybermen. All it looked to be to them was a publicity stunt of sorts.
"Oh, doesn't it look so pretty...? All these people, ripe for the harvest?" Missy purred in her coy-as-usual voice, standing beside the Doctor with an arm around his shoulders. "So blissfully unaware that they too will soon end up... dead?"
"What are you planning?" The Doctor could barely hold back his frustration and shock as tourists continued snapping photos and selfies. The Cybermen appeared to pose, standing still when a small crowd approached them. Missy ignored The Doctor, lifting up a wrist. She spoke toward the bracelets upon this wrist in a clear and authoritarian voice.
"Do not kill the Doctor!"
Bemused, The Doctor looked at Missy as if she wasn't already crazy enough to begin with, but as the Cybermen approached the two, her reasoning became clear. Once they were surrounded, he would have no way out. Scrambling into his coat pocket for his sonic screwdriver, he pulled it out, but Missy immediately turned her device on it. A thin, red beam of light shot from her device toward the screwdriver, sending a trail of sparks into the air long with a small puff of smoke. "You're not getting away that easily." She winked. The Doctor stared at his dysfunctional screwdriver in shock horror, pushing himself away from Missy as he pocketed it. However, he couldn't get far before being penned in by Cybermen who by now had made their way across the square. Those who weren't innocently posing with tourists had the Doctor surrounded.
"Tell me!" The doctor roared, barely able to contain his anger and confusion. "What are you planning?!"
"Oh dear, did you hit your head during the regeneration process? You weren't always this slow." Missy giggled, approaching the Doctor, raising a hand gently into the air, her bracelets jangling. "I'm going to show you something." Then she clicked her fingers.
Clara stood defiantly by the door of Doctor Chang's office that she'd failed to open. The Cyberman that'd once been resting in the Dark-Water-filled glass cabinet in the same room now stood before her, arm poised to fire a deadly laser shot.
"I'm more useful to you alive." Clara spoke assertively, with her full body facing toward the Cyberman.
"Negative." The Cyberman responded.
"Look, I'm useful. Look in your Cyber Network. Who do you know that can change their face at any given moment?"
Pausing for thought and to scan the Cyber Network, the Cyberman began to lower their arm, but promptly raised it again. "Clara Oswald does not change her face."
"Are you always this stupid? I'm not Clara Oswald!" She began advancing toward the Cyberman, who did not flinch, and merely trained its laser arm on her. Clara's eyes flickered over to the plaque that rested on the glass cabinet that the Cyberman had stepped out of. She quickly read the name on it, then turned her attention back to the Cyberman. "Your name is Doctor Skarosa. Therefore, Doctor Skarosa, are you not aware that I am much like you - a doctor?"
"A doctor?" The Cyberman's lights flashed confusedly. "You are not a doctor. You are Clara Oswald."
"No, Clara Oswald doesn't exist. I am The Doctor." Clara smiled, her voice increasing in desperation.
"Negative. The Doctor is outside with our leader - The Master."
"The Master...?" Was all Clara managed to say before a bolt of energy struck her in the chest, disintegrating her into a thousand pieces.
The Cybermen surrounding The Doctor and Missy suddenly stood to attention, saluting with a fist against their chest. The passer-bys stopped taking photos as the scene around them grew more eerie with every passing moment. The innocuous Cybermen who they'd been taking photos with had also saluted, interrupting many camera shutters and consequently presented a blurred picture on their iPhone camera rolls. The Cybermen horde pouring out of St Paul's had also stopped, many standing guard in a semicircle outside the building.
"We are under your command!" The Cybermen spoke in their traditionally robotic voice.
"Delete humanity in one hour." Missy grinned, not a shed of remorse crossing her face. The Doctor looked around, aghast, as the Cybermen assumed their standard posture before raising their wrist-mounted lasers. The first shot went out, scattering an unknown tourist into millions of atoms. The gathered crowd screamed, losing themselves among the throng of the panicked city in their efforts to escape as the rest of the Cybermen gathered around the Doctor and St Paul's also began to fire their weapons. Missy lowered the hand of the fingers she'd just clicked, and innocently latched onto one of the Doctor's hands. She pulled herself closer toward him, and as he backed off, the Doctor felt the familiar click of something on his wrist. He looked down to see that one of the bracelets that Missy had been wearing was now on his wrist. He reached a hand toward it to pull it off, but it held fast, the Gallifreyan symbols on its face lighting up with a faint red hue.
"They're yours to do with, as you command." Missy winked, stepping backward and mimicking a slight bow.
With a moment's hesitation as another citizen was sent to the abyss in a shower of atoms, The Doctor spoke toward the bracelet: "Stand down!"
The Cybermen however, did not stand down, and continued firing their weapons. He looked at Missy, who giggled as she adjusted her hat, assuming her ruling gaze. "But of course, I wouldn't be worthy of being The Master, if I hadn't accounted for your habit of trying to escape a desperate situation without casualties."
"What have you done, and what are you doing?" The Doctor approached Missy, nearly grabbing her by her collar in frustration. But of course, he knew that'd be exactly what she wanted, so he kept his distance.
"My, my, so many questions. Why don't you embrace the gift I've given you for once? The power to change... the planet. The course of time and history." Missy spun on the spot and twirled her umbrella, apparently enjoying the Doctor's predicament. "Why not use it to save those who you... really want to save?" She winked knowingly.
With one last look at his newfound gift, and with the knowledge that the Cybermen had been told not to kill the Doctor, he thought for a second - a difficult task with the bodies of unknown citizens being blown into tiny pieces all around him - and headed straight for St Paul's. As the Doctor ran with his red-trimmed tailcoat flapping behind him, Missy let out a little giggle.