Thank you for all the fab reviews for last chapter! XD I hope what's happening makes sense towards the end of the chapter, I think it's ok...

Disclaimer: I don't own Doctor Who.

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Jack, Rose and the Doctor stared for a seconds as there was a small crack of static, and the two people in front of them were gone.

"Teleport!" the Doctor shouted to no one in particular, running out to where they'd just disappeared, unknowingly pulling Rose along with him. He pulled out his sonic screwdriver, turned it on, and with a sudden crack of static they too disappeared. Jack blinked at the empty space in front of him.

"Oh, thanks!" he said sarcastically, then looked at his wrist device as he too tried to follow the teleport. But it didn't work, the signal was gone. He looked around in bewilderment, with no idea what to do now.

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The Doctor and Rose cracked into existence on a bare, rocky surface. Wherever they were, it was night, and it was cold. Rose gasped as she felt like someone had wrapped a cloth around her face, and struggled to breathe. The Doctor scanned the surface, and saw his past self standing a few metres away from them, clutching Deneeal.

"Hello!" he said cheerfully, waving at them.

"Hello," his past self replied in confusion.

"Tom, isn't it?" the Doctor asked. He stared at the Doctor, eyes wide. "Theta! Sorry, Theta," the Doctor said quickly. "I'm the Doctor and this is Rose," he said, looking back at Rose, who seemed to be wheezing. "You ok?"

"Can't… breathe…" she gasped, trying to take deep breathes.

"Yeah, the air is a bit thin, isn't it?" he commented.

"Yeah, just a bit," Rose said sarcastically. The Doctor smiled at her. "How come… you're fine?" she asked.

"It's a Time Lord thing," he answered. He suddenly looked around himself urgently. "Right, where are we?" he said, pulling his sonic screwdriver out. "Theta, any ideas?"

"Uh…" came the response. The Doctor sniggered.

"Where's Jack?" asked Rose.

"Must have left him behind when we teleported," the Doctor said, "let's get him…" he turned the screwdriver on, but nothing happened. "Teleport's gone," he muttered, "brilliant." He looked up to the sky, examining the stars. "I think we're on Fibster, an asteroid in Gallifrey's solar system… but why take us to Fibster? There's nothing interesting here…"

"I've lost count… of how many times… you've said that," Rose said breathlessly. The Doctor laughed.

"But why Fibster? I can't even find a power source…" he was cut off as the ground beneath them suddenly trembled and shook, a loud noise echoing around them.

xxxFLASHBACKxxx

"Doctor! Hold on!!"

"Rose!"

xxxFLASHBACKxxx

They stumbled as the ground shook, then stopped again. Rose surprised herself by not falling over. She felt very light for some reason, probably because there was so little gravity.

"What was that?" Theta gasped, clutching Deneeal tighter.

"I don't know…" the Doctor said, looking around himself. Suddenly it started again, only much, much more violent. The Doctor ran across to Rose and wrapped his arms around her as the ground moved sickeningly beneath them. Everything suddenly lurched, throwing them all to the ground. Rose clung onto the Doctor as everything became a blur around her. "This isn't right!" she heard him saying, "this isn't meant to be happening!" He jumped up and ran forward, somehow managing to keep his balance. "Who's there?!" he shouted to the air, "Come out and show yourself!" at his words the ground lurched again, throwing him into the air, the lack of gravity sending him flying upwards. He fell back down to the Earth, hitting the ground face-first. "Ugh…" he groaned, lifting his head up. His eyes widened as he saw a huge crack in the ground heading straight towards him. Rose seemed to see it too.

"Doctor look out!" she yelled.

He leapt to his feet, but was too late as the ground crumbled beneath him. He fell through the air, reaching out for anything to grab onto. His hand connected with a piece of rock and he clung on as his body dangled down, the rock falling below him. He looked down into the darkness below him, then back up to the ground above him. He reached his other hand up and grabbed the rock above him, but he could feel his fingers slipping.

"Doctor! Hold on!!" he heard Rose shout.

"Rose!" he called back, scrabbling on the rock with his hands. Rose tried to run towards him, but she was knocked over again as the ground shook. The Doctor managed to pull his hands forward, and swung his body up, kicking against the rock with his feet until he managed to get one foot on the ground. He pulled himself back up, straining his muscles, trying desperately not to fall as the ground shook. He rolled onto the rock, gasping for breath. He heard the ground again cracking beneath him, and jumped to his feet, running unsteadily across the shaking ground to Rose. He fell to his knees beside her, and they grabbed each other, each trying to protect the other one. To the side of them, Theta sat clutching Deneeal, worried out of his mind.

"What's happening?!" Rose yelled over the noise around them.

"This isn't right," the Doctor said, "this isn't meant to happen! Someone is doing this, manipulating the asteroid to make this happen!" they looked forward as the cracks began to spread towards them. "Run!" he yelled, pulling Rose to her feet. Theta also scrambled to his feet, and the three of them ran across the dancing ground away from the cracks that followed them. Rose and the Doctor ran hand in hand as Theta ran holding Deneeal.

Suddenly a crack spread across the ground in front of them, as more cracks appeared below their pounding feet. They stumbled as the ground separated and fell away through the increasing cracks. They carried on trying to run, but found them selves struggling to stay standing on the crumbling ground. Theta was the first to fall, as he leapt to avoid the falling ground beneath him. But as he hit the ground, Deneeal fell from his arms and rolled across the ground, crying.

"No! Deneeal!" Theta and the Doctor yelled at the same time, but it was the Doctor who ran towards him, letting go of Rose's hand. He dashed across to Deneeal, who was sitting on a crack which was beginning to open. He scooped him up into his arms just as the ground fell away below him, and leapt onto the other side. Spinning around, he looked in horror at Rose who had fallen to the ground as the cracks increased around her, then back at Theta who was in much the same position. The crack between him and Rose began to increase, and he found himself running back and jumping across it, only just making it to the other side. He stumbled, then ran back to Rose and pulled her back to her feet and held her close to him, wrapping one arm round her back as he held Deneeal with the other. He looked back up at Theta, who now had a huge gap between him and them, and the ground around him was crumbling away. But before the Doctor could do anything to help, the ground around him was already beginning to crumble away. There was nowhere left to run. He held Rose tightly as he felt the ground give way beneath him.