So: a CyberCloud over London, UNIT dangling Alec on a wire and ... Sasha's plummeting to her death! Enjoy!

Sasha fell, time returning to it's normal speed as she screamed. The ground was pulled towards her, and her to it. Hurtling. Faster. Faster! Screaming! Reaching out to the sky for help!

"SASHA!" Alec cried, watching the blur of his sister disappear out of the window.

Quickly, not having to think, he followed her!

He leapt out of the window, falling alongside her.

"What was that?" Kate cried over the buzz of the helicopter propellers, looking down out of the window.

"It's Sasha! She's falling!" Claire gasped. "SASHA!"

"ALEC!" the Doctor exclaimed, rushing to the edge of the window, watching his companions plummet towards the ground.

Alec tumbled through the air, his eyes focusing on his sister several metres below him. Quickly, he adjusted his shape, more aerodynamic and streamlined so that he cut through the air like a bullet. Below him, Sasha thrashed about, screaming in fear as the ground grew closer.

"Hold on!" Alec called to her.

He reached out his arms.

Sasha reached out hers.

The city flashed past them!

Their hands entwined!

Alec grabbed Sasha, pulling her closer to him – grasping her tightly! He slammed his palm against a device on his hip, connected to the wire. The wire stopped reeling out, stuck in it's position.

Above them, THE HELICOPTER JOLTED WILDLY – pulled through the air!

"WE'RE FALLING!" Osgood cried as the helicopter was flung downwards, towards the Tower.

The pilot pulled the helicopter sharply to the right, swerving it narrowly out of the way of the Tower.

"Woah!" Alec cried, feeling his heart drop as he and Sasha descended further, now mere metres from the ground.

The helicopter rose!

The Doctor sighed in relief, watching the helicopter pull Sasha and Alec back up into the air.

Sasha and Alec were reeled upwards on the wire and pulled by UNIT soldiers into the helicopter.

"Sasha!" Claire cried, running to grab her best friend, pulling her into a large, warm hug before she collapsed to her knees in exhaustion. "You had me so scared!"

Sasha just gulped, shivering in fear as Claire held her.

"Well done!" Osgood smiled, hugging Alec as her staggered to his feet. "You were brilliant!"

"Thank you! Oh my God," he gasped, barely able to stay on his feet.

"When you're tired of the Doctor, come to us," Kate congratulated him.

"Thank you," Sasha smiled, looking up at her brother.

"Hey. I was just looking out for you," Alec smiled, kneeling down beside his sister.

"I don't deserve a brother like you," Sasha sobbed, placing her head on Alec's shoulder.

The Doctor wiped his eyes, exhausted. He looked out across the city. Safe again . . .

Then he saw the CyberCloud!

"Give me your phone!" he snapped, swiping the phone out of the producer's hands.

"Hey! What are you doing?" she complained.

Frantically, the Doctor typed a phone number and held the mobile to his ear. "Kate! Is that you?"

"Yes, Doctor?" Kate replied. "Another Christmas saved. You're beginning to make a habit of this."

"No. It's not saved! Look at the sky. Look at the CyberCloud!"

Kate's smile diminished. She stepped to the edge of the helicopter doors and looked out across the city, watching the cloud. "Why? What's it doing?"

"Just think, Kate!" the Doctor snapped, worry spreading across his face. "That cloud holds every piece of data uploaded by CyberSocial users."

"Yes?" Kate agreed, her face beginning to concern everyone else in the helicopter.

"In which case, every single user has just uploaded the virus that destroys any Cyber programming . . ."

"Oh good Lord!" Kate stammered, realisation dawning on her.

"The virus is deactivating the programs that are keeping that cloud in flight!"

Suddenly, the lights covering a whole side of the CyberCloud switched off! The air was filled with the grinding, wheezing of engines – engines failing! And the groan! The horrific groan as the left hand side of the cloud shifted, falling downwards by five metres.

"No, no, no!" Kate cried, hanging up on the Doctor and dialling a new number into her phone.

"Kate, what is it?" Alec asked.

"What's happening?" Claire worried, looking out across the skyline.

"That cloud! The CyberCloud! It's going to fall!" Kate replied.

"It's going to fall on London!" Claire gasped.

In the city below, the streets filled with people. They looked up at the cloud . . .

And screamed!

In a way, the entire city shifted, everyone running out of the CyberCloud's shadow, dragging their children and loved ones with them in a mad panic. The streets were blocked. Panic filled the air!

And then the explosion!

A whole section of the CyberCloud, the size of building, burst into flames! Most of the wreckage was flung into the Thames, but the city below was scattered with debris.

"Oh Jesus!" Sasha gasped.

"You've got to stop it!" Alec cried. "That cloud is going that crush the entire city at any moment!"

"Calm down a moment," Osgood stuttered. "We can sort this out!"

"It's Kate Stewart!" Kate cried into her phone. "Calling UNIT Headquarters, I need you to direct me to the Special Weapons Department immediately! Code Red! Code Red!"

"Get out! Get out!" the Doctor barked at the camera crew, ushering them out of the top floor.

They obeyed, running down the stairs and out of the building, abandoning everything in the emergency.

"Hurry! Go!" the Doctor ushered them.

"I need a disintegrator!" Kate called down the phone. "Yes! The CyberCloud! Rip it to shreds!"

"You're going to shoot it out the sky?" Alec asked. "You can't do that! Chunks of it are going to hit the city!"

"Just wait and see," Kate instructed.

The CyberCloud screeched as it's engines failed . . .

It began to fall!

Underneath the city screamed as the mass of metal dipped downwards. The lights that covered it flashed!

"Fire!" Kate ordered. "I repeat: fire!"

Across the city, three beams of bright green laser light pulsed into the air, converging on the CyberCloud. The cloud swelled with the light, glittering in its emerald light like a diamond, before -

SMASH!

The entire CyberCloud burst into white ash – tiny fragments of shrapnel. And the cloud precipitated down on the city, covering it in a thick white blanket. It was snowing on the city!

Sasha's eyes glittering – the green light and white droplets glowing in the air.

The impact of the explosion shook the helicopter a little, yet its passengers were too focused on the wonder in the sky to care.

"Is that stuff safe? What is it?" Alec asked.

"Yes, it's safe," Kate replied. "Those rays – they split each atom apart and rearrange the particles so that they all form water. And from that height . . ."

". . . It's actually snow!" Claire smiled.

Wooop! Ok, so one more chapter to go, and it's time to say, "Goodbye." Oh, and as I promised, Alec finally gives The Doctor his present - trust me, it's important! Thanks as ever! Please review :)