Have you seen the first episode? It was goooooood (and that's all I will say about it as I don't want to spoil people).

There is an alternate ending to this fic, a more whumpy version of the first. I just couldn't pick which one to used so I have included both.

The last of the sparks had just faded as the three humans reached the end of the corridor, feet skidding on the polished metal floor and panting from their frantic sprint from the other side of the outpost.

That idiotic Time Lord had really done it, sacrificing herself to save the hundreds of lives on this planetoide, despite the warning from the tribe's elder that that machine would stop her heart if she activated it and stopped the prophesized curse.

They paused at the doorway, uncertain if more power was going to surge through the room or if it was safe to enter.

Graham, not as fit as the two youngsters, held onto a wall strut as he caught his breath. The sight in front of him made him feel more breathless than the run had been.

The Doctor lay sprawled at the base of the machine. She was still, eyes shut, coat, hair and limbs spread wide. From this distance they couldn't even tell if she was breathing.

They paused at the entrance way, unsure if it was safe to enter, but moved after Ryan took the first step towards the unconscious Time Lord.

They gathered around her, Graham kneeling at her side whilst the others stood, stiff with uncertainty.

Graham carefully picked a limp hand and pressed his fingers into the Doctor's wrist.

"Is she dead?" Asked Yaz.

"No," he replied. "I can feel her heart beating….. wait, I'm supposed to feel two hearts. That thing really did stop a heart."

"Shit, what do we do?" Ryan anxiously ran his fingers across his hair, pacing a few steps up and down.

Graham reached out with his other hand and rolled the Doctor's head so that it was facing him and hovered his fingers above her mouth.

"She's breathing, but weakly." He moved his hand to her cheek, tapping it first but when that elicits no response he shook her shoulder.

"Doctor, wake up."

The Doctor's brows wrinkled and she groaned in pain as she started to come to.

"Oh thank goodness," sighed Yaz in relief. Ryan stopped his pacing.

For a second the Doctor's eyes opened but then snapped shut again, her breath hitching and hand clutching at her chest in pain.

"Doctor?!"

The Time Lord's other hand shot out and grabbed Graham's shoulder and used it to leaver herself up, listing sideways as she hunched over. Graham grabbed her by the shoulders so she wouldn't fall over.

"Gagh!" The Doctor gasped, breath shuddering.

"Doctor? What is it? What's wrong?"

""Heart," she ground out between pants of pain. "One heart's not working."

"What can we do?"

"Tardis. I can restart it in the Tardis."

"Right. Can you walk?"

"Think so. Just get me on my feet."

Three pair of hands quickly get her standing on unsteady legs, Graham supporting her on one side whilst the other two stood by, uncertain what to do now.

"Is there anything we should do to the machine?" Asked Yaz looking at the mass of metal and wires they were standing next to.

"No," replied the Doctor, still panting, "should be dormant. Just don't touch anything on it- aaggh" The rest of the Doctor's breath was lost in an exhalation of pain as she hunched over further, knees buckling and nearly slipping out of Graham's grip on her.

"Ryan," said Graham in alarm, "get her other arm. We are going to drag her to the Tardis if we have to. Yaz, make sure the way is clear. We will be right behind you."

"Right," said Yaz as Ryan looped the Doctor's free arm over his shoulders. "Be quick, yeah. She really doesn't look good." She turned and disappeared down the corridor they had run down.

"Ready to go?" Asked Graham. Ryan nodded back. "Come on Doctor, just one foot in front of the other."

The three started to shuffle forwards, the Doctor's legs not a strong as she hoped and the other two adjusting to each others different stride lengths and trying to make sure the Doctor was jostled as little as possible. The height difference didn't help, Ryan being a good few inches taller than Graham and the Doctor being about the same height shorter than the smaller man.

They had sped up by the time they had crossed the room and started to make their way down the corridor, Ryan and Graham matching strides and the Doctor gathering strength from somewhere and bearing most of her weight. She had even got enough breath back to talk, though her voice was laced with pain.

"I'm sure this hurts more that last time."

"Last time?" Asked Ryan.

"Invasion of the cubes"

"Oh yeah, I remember that. We threw a load off the science block back fire escape in physics lesson once."

"We can continue this another time," Graham cut across the conversation before Ryan or the Doctor, who despite her pain looked intrigued at the cube throwing, could ask any more questions.

They could see Yaz waiting at the end of the corridor, looking around the next corner. She spotted them and gave them a thumbs up. Ryan returned the gesture and she disappeared, securing the path ahead.

"That machine was a really great piece of technology," said the Doctor, either because she just had to fill the silence that had settled among them or as a distraction from the pain. She tried to sound cheerful despite the painful breathlessness of her voice. "Bioelectrical engineering. It uses the energy that keeps your heart beating as the trigger. It's a good thing I have two hearts, had any of you done it you would be stone dead. The only problem is that the trigger took more power than from just one heart. The one that is still beating is compromised and is in the process of failing and I'm not entirely sure my cells have enough energy in them for regeneration."

"What?!" Exclaimed Ryan and Graham in each of the Doctor's ears.

"What can we do to help?" Asked Graham.

"Just get me to the Tardis."

They forged on again in silence, only broken by the Doctor's pained gasps. They occasionally saw Yaz checking the way ahead, giving them increasingly concerned glances each time. They saw no one else, the base that should have been filled with a few hundred people seemed to be deserted.

They should be close to the Tardis by now but Graham was increasingly worried they weren't going to make it. He could hear the Doctor's breathing, loud and laboured in his ear and he was finding that he was holding more and more of her weight. Whatever strength she had left sounded like it was waning fast.

Finding the Tardis nestled safely in the alcove they had left it in was a blessed relief. Yaz had already unlocked the door and was waiting impatiently for them to appear. She shut the door behind them as the two humans helped the Time Lord across the threshold. The Doctor didn't make any indication that she had noticed that the air had changed from the warm, humid air of the outpost station to the cool air of the Tardis, just continue to almost hang off the shoulders of her two companions. Ryan and Graham looked at each other over the Doctor's bowed head and wordlessly agreed to head to the medbay.

The lights were on when they reached the Tardis' medical room. Graham and Ryan looked to the Doctor for some sort of reaction, but got nothing.

They sat her on the bed. She really didn't look good, eyes closed, head sagging and she was panting like she wasn't getting enough oxygen. Given that one heart wasn't working and the other failing that probably was the case. She didn't even seem to realise that they had stopped.

"Doctor?"Asked Ryan, holding her arm to keep her upright. "Doctor!"

"Hhmmm..," she murmured. She seemed to wake up as if she had been asleep, uncertain for a few seconds where she was. "Oh, we're here."

"Yes, Doctor, back in the Tardis. Now what can we do to help. You really don't look well."

"Heart stimulant." She waved an arm towards the shelves littered with different containers of medicine. "Get it. You're looking for a glass tube about the length of your finger with- aaggh.." Graham caught her as she swayed his way, stopping her from falling off the bed. She took a few seconds to catch her breath. "..with...with a red cap. Should have a green crescent on it. And I'll need the injector in the draw. Yaz, by your left hand."

Yaz picked out the strange contraption out of the draw and carried it over to the Doctor. It looked like an alien ray gun crossed with some sort of futuristic tin opener.

Ryan left the Doctor propped up against Graham's hands and searched the shelves for the correct vial. There were several tubes with different shades of red caps, all with a green crescent. He brought all of them to the Doctor.

She picked one vial out of Ryan's hands then look the injector, slotting them both together with shaking hands.

"Right," the Doctor said, shoving one sleeve up past her elbow with her other hand. "This should get my stopped heart working again. It'll keep my working heart going for a little bit longer at the very least."

"What?" Graham said. "So this might not work?"

"It'll work. Just give it a minute."

She placed the injector in the crook of her bare elbow and with a click and a hiss emptied the vial. The device was then left at her side as she gasped and panted through a sudden pain, hand pressed to her chest. Graham found his fingers unintentionally clutching at the Doctor's shoulder.

It was a long, agonizing few seconds before the Doctor's breathing eased, sagging in Graham's hold. But before he could exclaim in alarm she suddenly sat up straight, with a big grin on her face.

"Oooo, that's better! Two hearts beating like drums once again. Bing bang-a boom!"

She leapt off the bed, startling the now smiling and relieved others and clapped her hands together.

"Right! Now that we've got that sorted, where to next?"

Alternate ending.

She placed the injector in the crook of her bare elbow and with a click and a hiss emptied the vial. The device was then left at her side as she gasped and panted through a sudden pain, hand pressed to her chest. Graham found his fingers unintentionally clutching at the Doctor's shoulder.

It was a long, agonizing few seconds before the Doctor's breathing settled. She seemed to perk up a little, sitting up straighter under her own power though the lines in her brow didn't disappear. She placed two fingers at her own wrist.

"Doctor?" Asked Ryan.

"Right," she said. "Plan A half worked so time for plan B."

"Half worked?" Asked Yaz.

"My working heart is back to normal but the other one hasn't restarted, which isn't good. So given that energy taken out of it stopped I just have to hope that putting some back will start it."

"What?" Asked Ryan.

"How?" Asked Graham.

"In that cupboard, Ryan," said the Doctor, pointing to correct one, "Is a small grey box. Bring it over here."

The grey box in question was about the size of a hardback book and inside was a grey cube and mass of wires. The Doctor took them both out and unravelled the wires, plugging them into the cube. It beeped and the Doctor tapped one side, lighting up a display

"What is it?" Asked Graham.

"You have them in hospitals in your time, thought I don't know what you call them. An electrical shocky thing. A previous companion used one on me and it really wasn't pleasant and I was hoping not to have to repeat the procedure. Anyway, now I'm going to need some help. Yaz, you stay, boys I need you out. Ignore any noises, this is going to really hurt. I'll call you back when I'm done."

Ryan and Graham left as the Doctor handed Yaz one of the leads, shifting off her coat and tugging at the bottom hem of her shirt in the process.

They settled against the wall down the corridor, waiting, both flinching when they heard the Doctor's loud yell of pain. She appeared a minute or two later, still breathless and coatless, but standing on her own and smiling.

"Plan B was a success."

She settled her braces that were hanging at her side back on her shoulders and shrugged on her coat that Yaz had handed to her. She looked at her three friends.

"Right! Now that we've got that sorted, where to next?"