Of Proposals, Revelation and Consequence by Hobbit

The Cheetah people eyed Mickey with content, though they did not touch him for fear of the Doctor.
"Take a picture, it lasts longer," Mickey said huffily crossing his arms. As much as he was starting to relax (the Doctor's threat was keeping them at bay), he still found it very uncomfortable being stared at.
"You will not be so cheeky once your friend has been disposed of," one of the Cheetahs hissed.
"What do you mean?" Mickey frowned.
"We need the Time Lord for only one thing," the Cheetah continued. "Once we have finished with him we will kill him. Then there will be no one to protect you."
Mickey didn't like the way the Cheetah's eyes flashed dangerously. He shuffled from one foot to the other, avoiding eye contact now in the hopes tat the Doctor would return soon.

Meanwhile back on Earth Rose and Jackie were once more stood outside the TARDIS.
"Are you sure he's not just lost inside there?" Jackie asked indicating the TARDIS. "I mean it's big enough."
"No, look, Mum," Rose ran a hand through her hair. "The TARDIS gets inside your head right? So it's got like a telepathic link…"
She saw her mother's blank look.
"Trust me, I'd know if he was in the TARDIS," Rose finished.
"Well, I'm going back," Jackie said. "The Doctor'll turn up eventually and I can't keep David waiting."

Rose watched as her mum retreated back to the flat, leaving her all alone. She leant against the TARDIS and sank to her knees, thinking. She knew the Doctor wouldn't just leave her like this. He'd have rung, or left a note, or… something, but he wouldn't have just left. Not without the TARDIS and especially not with out her. Something must be deadly wrong; Mickey was missing as well which meant that he and the Doctor must've been together somewhere.

Rose banged the back off her head against the TARDIS repeatedly trying to think of anywhere they might be. The Doctor hadn't mentioned anything odd about Earth when they'd arrived so wherever they were, whoever had him and Mickey had taken them by surprise.

"C'mon, think, think," she told herself getting more and more angry. Rose pulled out her phone again and tried once more to phone the Doctor. There was a dial tone but still the Doctor didn't pick up.

That was the final straw. Standing up Rose opened the TARDIS doors and headed up towards the console. She walked round to the screen and paused, clearing her throat.

"I need your help," she said, feeling stupid that she was talking to a Time and Space ship. "I need to find the Doctor. Can you track him for me?"
The TARDIS remained silent for a moment, before suddenly chirruping into life. The screen displayed a planet Rose had never seen before.
"Ummm, any chance of you being able to take me there?" She asked hopefully. The doors swung shut behind her and the TARDIS started up.
"Thank you," Rose whispered, finally glad she was going to find the Doctor.

The Doctor was led into the large tent and shown to an inner door.
"The high chief Palos will see you now," one of the Cheetah guards who'd been escorting the Doctor announced.

"Will he now?" The Doctor asked pulling the inner door aside and letting himself in. What he found was much what he'd expected. There, sat on a throne made out of what looked like human bones, was a rather large Cheetah with a magnificent headdress. Female Cheetah's, who were either purring over him or feeding him grapes, surrounded him. The Doctor rolled his eyes.

"Ah, Doctor," Palos growled in a deep voice.
"That's me," the Doctor grinned waving at the Cheetah.
"I have a little proposition for you," Palos continued as though he had not been interrupted.

"Really?" The Doctor said with mock curiosity. "I'd've never guessed that's why you transmatted me off Earth and had a wagon travel halfway across your planet with me inside."
"You are very calm for someone who is about to be forced to give their life away," Palos commented his tone suddenly turning dark.
"You hadn't mentioned that I was being forced to give my life away," the Doctor said, frowning slightly.

"That is the deal," Palos said smiling like a Cheshire cat. "We need to give our species a boost. Therefore we want to integrate your brain into our race. To do that we will, of course, need you to become one of us."

"You seem to be under the impression that- oh what's the phrase again? - that I will 'come quietly'," the Doctor said his sarcastic ness returning.
"Oh you will come quietly Doctor," Palos said his grin not faltering.
"Nah, don't think so," the Doctor said, grinning back.
"Then we shall have to kill the girl," Palos said, eyes flashing maliciously. The Doctor paled.
"What girl?" He asked, trying to sound as though he had no idea of whom they were talking.

Palos and the females that surrounded him all laughed. The Doctor could feel himself getting edgier and edgier. He only hoped Mickey was all right.
"Rose Tyler," Palos said once he'd regained himself. "Your little companion. She'll be wondering where you've got to, won't she? Probably come looking for you."
The Doctor closed his eyes as his phone suddenly started ringing. Perfect timing, Rose, thought the Doctor as one of the Cheetah guards took the phone out of his pocket and showed it to Palos.
"Ah, little girlfriends worried about you," Palos said in a baby voice. He laughed again before looking straight at the Doctor seriously, all silliness gone. "If you do not hand yourself over, we will kill the girl."

The Doctor simply looked at Palos, he refused to answer. He wasn't going to just hand himself over to this race and here was certainly no way he was going to let them get their paws on Rose.
"My guards will show you out now," Palos said nodding to them. Two Cheetahs grabbed each of the Doctor's arms. "I will give you twenty four hours to come to a decision. If you still refuse to hand yourself over, then Rose Tyler will cease to exist."
"Sir, sir!" A Cheetah came running in and the Doctor inwardly groaned as he heard the worst sound possible at that time. "We've got an unidentified ship landing just outside. The human seems to recognise it!"

I'm going to kill you Mickey Smith! The Doctor thought as he heard the sound of the TARDIS materializing.