"How are you doing with the liquid nitrogen delivery system?" Captain Jack asked the Doctor needing to carry on with the business of what was going on as well as ensuring that all of them had the care they needed.

"We have designed the basic delivery module and Major Starkey has forwarded the design to her team of engineers who are building the prototype as we speak. They have taken one canister of the nitrogen to test it and we have one here as well," the Doctor advised.

"Okay, good, what other updates do we have?" Jack directed the comment to Private Coates.

"The administration building has been confirmed as evacuated and secure. There has been no incursion into the area and no casualties amongst the administration staff. They keep on complaining about if that it was cold and now they have to evacuate into the cold. They were not told why they were evacuation so a panic has not been started," Private Coates arrived. "They have been advised to wait in the main canteen where they are warm and have access to refreshment."

"Is it cold in the admin block?" the Doctor checked.

"Yes, Sir, the ventilation system is linked between the two areas. Because the autopsy lab got too hot the administration block was ventilated to only 16 degrees in an attempt to cool the air down in the autopsy lab as well. Both areas are at below average room temperature now and feel quite cool, not that it really matters now," Private Coates offered.

"Actually, it might really might matter," the Doctor commented. "It is still quite hot in here isn't it?"

"It is rather warm," James agreed. "What are you thinking?" he asked the Doctor. "Why does the temperature matter? I'm not even sure what has fully occurred here?"

"Subject 76584 woke up on the autopsy table. It killed Luke Wilson and Walt Hindon who were conducting the autopsy and then it broke out of the autopsy lab through the bulletproof glass. It is responsible for the holes in the shutters that you had to pass through. It made them with its bare hands so has significant strength. It has also killed and caused significant injury to many of the unit soldiers instructed to attempt to contain the creature. It was shot in the existing head wound and it has bolted. It has gone into the extraction units in the autopsy lab and we have since discovered that is not an isolated system but that it can access all extraction ports and ducts even if not the main ventilation," Private Coates effectively brought James up to date.

"The temperature is significant because we believe it was the cold temperature that kept it dormant and made it appear to be dead," the Doctor advised. "It is entirely positive that it would have been brought out of the dormant state when the autopsy began, however, the activity of the subject would be increased due to the temperature," the Doctor suggested. "If cold adversely affects it then it will not move into areas where it is cold, but may well move along a positive thermal gradient to maintain its own recovering body temperature and level of activity," the Doctor offered. "It is behaving like an exothermic organism and that would predict it would move into an area where it is warm rather than one where it is cold."

"It is in the extraction system not the ventilation system," Major Starkey commented when she saw James was cooling up at the vents in the ceiling of the room. "This is a medical quarantine area," James commented.

"I think we're beyond that now," Wilfred laughed.

"Yes, quite, but, we use it when a real quarantine is required in the case of infectious diseases. We also use these rooms to introduce sterile isolation if we are dealing with a patient with an immune compromised patient," James suggested. "The systems were put in place when the area was refitted as the hospital. I don't know if it is linked into the existing system or whether it is totally new but there are facilities for positive and negative pressure to be applied in here."

"Negative pressure?" Private Coates asked not sure what that meant.

"The room can be sealed and then a small amount of the air is sucked out to create a partial vacuum so that there is natural airflow from the room to another but only in one direction. It means if there was an infectious person in this room that when you opened the door the air outside would be pulled into the room and the infectious agent would remain in here, or, if the person in here had to be isolated and protected then the air would be pumped in to make it a more dense air so that it flows outward when the door is opened," the Doctor explained.

"Is that the same in all of these rooms?" Jack asked.

"Not, just in rooms one and two," James advised.

"And, this is room number one?" the Doctor confirmed.

"Yes."

"And it is hot in here but cold everywhere else?"

"Yes."

"And we don't have a soldier parked under this vent with a gun?"

"No." Major Starkey looked to Jack awaiting for instruction so she could give her orders.

"Get the wounded out of this room and out of room two. Get armed units into this area. Hurry the mechanics with the liquid nitrogen delivery system and get maintenance to blast this area with cold air, we need to bring the temperature down as rapidly as we can. Any blowers or fans that are available get them in here. We do not want that thing coming down into the East Wing, so try and increase the temperature in some of the currently vacant rooms where there are extraction points or ducts."

"Right," Major Starkey nodded as she took in all the things that Jack had said. She went to go out and give the required instructions but was almost bowled over by the member of unit Foxtrot Alpha who had been positioned in the autopsy lab. "Watch it?!" Major Starkey exclaimed as the soldier almost went skidding down onto the floor in order to avoid the commander as she was coming out.

"It is moving!"

"Sorry?"

"It is in the extraction system. It's not coming back down, but it is moving! We heard it move!"

"Where is it moving to?" Major Starkey checked.

"It is quite possible that we are now aware of where it is likely to go and that it has decided to make a pre-emptive strike," the Doctor advised.

"How could it know what we know?" Major Starkey asked.

There was a sound of metal clattering and then a blood curdling scream that was cut far too short. It came from in the adjacent room.

"Fuck! It's here!" Jack grabbed at the canister of liquid nitrogen left in the Doctor's room and bolted out of the room. He burst into the room next door. Two soldiers had been injured and were in beds in there being monitored by a nurse. The soldiers had been killed in their beds, there was an arch or blood up the wall and the nurse who had been keeping them stable was on the floor. Her throat had been ripped out. Her eyes were open and fixed. None of them had stood a chance in the confined area and they'd been killed in a matter of seconds. Jack just saw the legs of the Harlequin as it headed back up into the extraction vent.

"Get back down here you bastard!" Jack screamed at it. He tried to grab hold of its trailing leg to drag it back down but it was too quick. "Come on! Take me!" Jack yelled at the ghost but was ignored by it.

In the Doctor's room the Time Lord tensed and his leg screamed at him as a result, but it was not as loud as the screaming in his head. That was coming down from the vent like the frosted air that had started to flow. The vent was directly above his bed, so when the cover of it smashed down it landed on top of him and made him scream out in pain as it jostled against the wires on the elevating sling holding his leg still. Private Coates and Wilfred both instinctively went to protect the Doctor and to shove his bed out of the way. They rammed into it with such a force that were the brakes were on the bed started to tip.

"Don't!" the Doctor exclaimed. He didn't care about the bed tipping, but he could not let them put their lives in more danger to move him out the way. He grabbed hold of Wilfred and hold of Private Coates and with all of his adrenaline boosted strength he yanked them over the bed with him as the bed tipped right over toward the wall. The canola and drip was ripped out of his arm, but it was nothing. It was so close to the wall that the frame above it buckled and folded and the bed crushed them down into the wall and the floor as it fell over and the mattress followed a little. The Doctor screamed in a raw agony like he never felt. The Doctor screamed and when his breath ran out he gasped and wheezed to fill his burning lungs only to lose it as he screamed again and then again. Wilfred and Private Coates were in a tangle on top of the Doctor and under the mattress where they had all been dropped over the tipping bed.

Jack burst back into the room. The Harlequin ghost had dropped down into the space where the Doctor's bed had been but was now tipped over. It was half on the floor and half on the underside of the bed frame where it was tipped up. The mattress was covering the Doctor, Wilfred, and Private Coates muffling the Doctor's agonised shrieking, but the ghost knew they were there. Major Starkey was pressed against the wall on the far side of the room, unable to move and to get out of there at all, she was hyperventilating as she looked at the strange creature. It was entirely covered in scales and there was no way of knowing who it was looking at or where it was going.

It seemed to stall a little in the middle of the room though. Of all the people who Jack expected to be a hero in a crisis? James Lloyd had to be bottom of the list, yet as Jack ran back into the room he saw James leap onto the Harlequin and try to pin it down. It was heroic, but it was also idiotic. This was a creature that had broken into bulletproof glass with its bare hands, had forced its way through solid steel shutters, and had basically ripped men and women limb from limb with not regard, yet James didn't freeze or back away or try to retreat. He tackled it.

The ghost seemed to be dazed or less active than Jack expected to see it. It flung James off it easily, smashing the medic into the wall and the bench right across the other side of the room so that James crumpled down in a heap on the floor, but the Harlequin did not follow through with the expected attack. Something was wrong with it. Either where it had been shot or something new. It was almost as if it had stalled and was searching but couldn't see clearly. There was a slight iridescence across the scales as if it was being subjected to some kind of energy.

Jack almost stalled himself as he could hear the Doctor's horrific screams coming one after another from behind the bed. It was as if it pricked the back of his mind and he was sure that his leg was breaking as well. The Doctor was in so much pain that he was projecting from him in telepathic waves and while Jack had a very basic ability and it prickled against him, he realised it was that disorientating the Harlequin. The Doctor was in so much pain he was crippling it.

"Stay back!" Jack exclaimed when two soldiers burst into the room with their guns drawn. They couldn't try to shoot it in the room. It was going to be too dangerous. Jack took the lid off the liquid nitrogen canister. They had not come back with the delivery system yet, but there was two ways of doing that. He bowled into the alien and drove it down to the ground, it gave underneath him and Jack poured the nitrogen onto it. Not just aiming for its head but letting the cold liquid pour over it so that the icy gas leapt up as it immediately vaporised. It worked though. The Harlequin let out a telepathic scream and tried to get away from the nitrogen, but it started to slow. Jack wasn't sure that it was actually freezing, but it collapsed down and he was able to pin it.

"Private!" Jack called to Private Coates as he managed to get out from behind the bed and clamber over from it. They had to deal with the Harlequin and then they would deal with the Doctor. "We need to keep it cold and secure!"

"The drawers in the morgue," Private Coates advised. "They're refrigerated."

"Brilliant," Jack agreed. They grabbed the Harlequin between them. It was heavier than it looked. Jack, Private Coates, and the two soldiers all grabbed a bit of it and then ran with it to the morgue as it twisted and fought slowly, but not able to react as it's body temperature was still dropping rapidly with the effect of the nitrogen that had frozen some of the scales on its surface. They were frosted. They shoved it in a morgue drawer and Jack found the controls. He yanked the temperature down as far as he could so that it would take it down to just one degree over freezing. "What is behind these drawers?" Jack asked him. "We need to know what the back of them is, I am not having it break out the back of it if it does come back. Get Major Starkey to get the specifications and ensure that it can't get out the back!" Jack instructed to one of the soldiers and they agreed. "It needs to be a secure line either side. I want full armed units at the rear and at the front of the morgue and I want you to have liquid nitrogen available."

"Yes Sir!" the soldier he was tasking to carry out his instruction acknowledged and went to liaise with Major Starkey. He then hurried back himself knowing that the Harlequin was secure, at least for now, and because he needed to see to the Doctor.

"Is it dead?" Major Starkey asked as Jack went back in.

"I don't know how to tell," Jack admitted. "It is secured in the morgue drawer."

"It would have to get through a steel line in order to get out the back of the drawer and the morgue wall," Major Starkey offered. "It will more likely come out the front."

"Until we can figure out if it is dead or how to kill it we need to keep a guard on either side with liquid nitrogen and we still need that weapon and to work on how to contain it," Jack advised though he was no longer talking to Major Starkey in direct conversation but was taking in the room. He hurried over to the tipped up bed where the Doctor remained in a state of acute distress and continued to cry out and yell though his voice was losing its strength and it sounded like he was sobbing through the exhaustion with it as well. Jack couldn't get behind the bed without moving it and he didn't want to just do that because the Doctor was on the floor on his side.

Wilfred was still down there was well and he was holding the Doctor, trying to support him and keep him still. His leg had been elevated on the sling on the pulley system that was on the frame above the bed but that had been squashed and twisted to nothing as the bed had gone against the wall. The wires were still on the sling that was still around the cast, but the Doctor was on his side, tipped up into the wall so that the weight of the heavy cast was resting on his smashed knee against the wall. They couldn't see what had happened to his leg itself, but based on the unrelenting agony that the Doctor was in they knew that it couldn't be good. "It won't be long, Doc," Jack tried to assure him.

"There you go, Son, I told you Jack would be back soon," Wilf assured the Doctor. "We'll get you righted and back into bed in no time now."

"We'll get you out in a moment, Doc," Jack agreed. He didn't want to do anything that might make him worse. The Doctor wailed and cried out as Wilf just held him. Jack went to James first. He had been thrown against the cupboards and the wall by the Harlequin and was slow to get up, though he was starting to do so. "I'm not sure if jumping on that things was very brave or very stupid," Jack commented as he crouched down beside the medic.

"Stupid, I should think," James commented quietly.

"Take you back to your rugby days, huh" Jack checked. James nodded surprised that Jack had paid that much attention to their conversation earlier. "Has it hurt you more than your knee?"

"Took a good whack to the side, so a few bruises I should think, maybe a cracked rib," James offered and rubbed his side where he'd hit the edge of the counter. "Nothing to worry too much about. We best see to the Doctor hadn't we?"

"I think so," Jack nodded. "Will you be able to advise me on how best to get him out? He's pressed right up between the bed and the wall," Jack offered. He gave James an awkward hand to up. Unable to bear weight on his left leg it was even more difficult as his side was painful as well. He hopped awkwardly over to the side of the bed.

"Doctor? We're going to help you out now," James assured him. "Major Starkey, rather than just standing there, could you go and get Gerald back in here to assist if at all possible," he commented. "I need to unhook all of these wires before we think about doing anything," James commented as he looked at the way they were all tangled through the mangled bed frame and still on the sling hooked around the Doctor's leg. "I will do that while we wait for Gerald." James commented. Three of the four wires were totally slack and easy to remove, but the fourth was tight as it took some of the pressure of his leg. When James unhooked it the Doctor's scream escalated. "I'm sorry, Doctor, it won't be long."

"James?" Gerald came in. "What happened?!"

"We found the point the Harlequin was going to come out," Jack indicated to the busted ceiling vent above. "It's been dealt with. James tackled it and we got it with liquid nitrogen, but his bed tipped. Now we need to sort him out."

"Where is the ghost?"

"It's in the morgue secured in a drawer and under guard," Jack advised. "I don't think it will cause us any more issues."

"We need to get some ketamine into him to do this," James instructed. "I can't move him when he is in this kind of pain. Do you recall the exact dose that Martha gave him?"

"I believe it was 2.8ml," Gerald commented.

"You believe or you know?" James checked with him. "I can't afford to take a risk with him."

"I will go and double check." Gerald turned out of the room to leave the East Wing. He saw two soldiers standing guard on the next door room. When he looked in the two soldiers on the bed had been killed and Maggie Taylor was on the floor. She was dead too. Gerald took a deep breath, there wasn't anything they could do but they still had critically injured people to deal with and the Doctor needed assistance. Gerald left the East Wing trying to remain composed. He ran down to the surgical theatre where Martha had taken Colonel Mace. They had been in there for some time now so Gerald guessed that Dr Carter would be heavily involved with the surgery. He hoped it was going well and that Colonel Mace was stabilised. There were soldiers on guard outside the theatre as well as two positioned inside, with the Harlequin now secured it was probably not necessary but they would maintain a security presence just in case.

Gerald went into the theatre but into the observation area rather than into the sterile zone. He was far from being sterile and he was not dressed for surgery. Martha was working on the Colonel. She had made a long incision across his hip and down his thigh at the side and was trying to repair as much damage as she could. It looked like she had got the orthopaedic tool kit out as well and there was some metalwork ready to be used so it looked like she was going to go straight through and do the stabilisation of his femur fracture as well.

"Doctor Jones?" Gerald called her over. It was not ideal but Martha was at a point where she could leave him for a moment and Dr Carter could carry on with the cleaning of some clotting blood out of the wound in order to close it. "The Harlequin Ghost has been secured in the morgue after being taken out with liquid nitrogen," Gerald advised.

"Oh, that is good news," Martha commented. "I have half been expecting it to drop in onto the table through the ceiling vents," she offered. "Is it secured?"

"Captain Jack has indicated that it is," Gerald confirmed.

"He won't be taking any chances with it," Martha was happier that Jack was on it than she would have been if any of the UNIT team were on it apart from Colonel Mace and he was under her knife.

"Have there been any more casualties?"

"Three more dead," Gerald commented sadly. He could let them know that one of their colleagues had been killed once they had finished operating on the Colonel.

"Where was it apprehended?"

"In quarantine room one."

"Q1? That is the Doctor's room in the East Wing?!"

"It came down through the vent there. It looked like it must have come down into room 2 first, then it came down in room 1. James Lloyd rugby tackled it and then Jack got it with the liquid nitrogen," Gerald offered.

"James has been found then?" Martha wondered if he would come down and assist with the insertion of the femur nail she was preparing to hammer along the length of the Colonel's thigh. She'd assisted James do it a few times now, but had never led with it. It was a fairly straight forward task though and she was confident she could do it. She would be just more confident if James was in there as well.

"His knee has gone again. It looks pretty bad for him, but that was before he rugby tackled the alien. He's asked me to come down here because during the attack the Doctor's bed has tipped over. We need to know how much ketamine we can give him to get him back up and on the bed. At the moment he's kind of wedged between it and the wall and he's certainly not happy," Gerald commented.

"He's got dijalipam in the drip," Martha commented. "He shouldn't really be given any ketamine while he has that in his system. I expect in combination they will make him feel pretty nauseous again and they both run the risk of respiratory suppression at the kind of doses he is needing at the moment," Martha commented.

"We're not going to be able to get him up without giving him something. He is really hurting," Gerald advised. "Is it just the respiration suppression? As long as we are wary of that we can deal with it can't we? If the worst came to the worst we could ventilate him and the ketamine will wear off quickly. It would only be for a short period of time," Gerald offered.

"Okay, but if you have to intubate him then you have to make sure you use the large adult straight miller blade laryngoscope and not the curved Macintosh blade or you're going to damage his throat, and, don't forget that he has a respiratory bypass system so if he does seem to stop breathing but his blood oxygen level doesn't go down then it is just that, don't intubate until his blood oxygen level starts to go down, then as long as you use the straight bladed laryngoscope he will be okay," Martha commented.

"Okay," Gerald nodded.

"And you do it okay, not James, not if he's injured his knee again."

"He's braced it up but he's not putting any weight on it," Gerald commented. "How is the Colonel doing?"

"He had a traumatic femoral aneurism that blew out. We got him in here just in time. He's had seven pints of blood pushed through and his blood pressure is starting to hold again. I've repaired the artery, we had to graft it with a bit of vein and put a stent in but it is holding. So we don't have to risk opening him up without having sight of the artery we're going to continue on and stabilise his hip and femur at the same time. It's going to take another hour or so," Martha commented. "It is a straight forward intramedullary nail and a locking screw up through the neck of his femur into the head. James won't have to worry about this one," Martha advised. "Don't let him do too much if he is hurting," Martha commented. "And he's been rugby tackling aliens?" she checked and shook her head.

"Yeah," Gerald nodded. "I better go back."

"Make sure you return and let me know the Doctor is alright," Martha insisted. "And, if you need to intubate remember…"

"Large adult Miller blade," Gerald offered. "I've got it," he confirmed and then left Martha to get back on with her surgery. Gerald hurried back and went into the pharmacy and picked up the ketamine. He then went into the store and made sure that they he got hold of a straight bladed laryngoscope so that they could intubate the Doctor without damaging his throat if they needed to. He went back in with the kit. "Are you sure we have to give him the ketamine?" Gerald asked. "Martha is worried that it has a respiratory suppressive affect and so does the dijalipam from in his drip. She also thinks it will make him feel unwell and nauseous with them mixed up."

"We can't deal with him unless we can give him some additional pain relief," James advised. "Not when it is going to be protracted. We're going to have to take our time with him. He's in completely the wrong position to be in with a split cast. If it was a quick up and into bed then I'd just go for it, but not when he's like this," James offered.

"We can give him 2.8ml. If he stops breathing we have to wait until his oxygen levels start to go down because he might just have gone into bypass, and then if we have to intubate him we have to use the straight blade," Gerald commented and put the laryngoscope on the side ready just in case. James nodded and Jack looked at the precautions they were taking wide eyed, were they serious about him stopping breathing?!

"Can you get in to give him the drug?" James asked. "There is no way I can get to him until the bed is out the way."

"Yeah." Gerald drew the dose up and then had to put one leg over the bed and lean down to the Doctor. Wilf was holding him. "Wilfred, can you just lift his arm up this way a bit from where you are?" Gerald checked and Wilfred obliged. "Doctor, I'm going to give you a shot now. It's going to make you feel sleepy, like before, okay? Just go with it and allow it to help you relax," Gerald commented. He injected it directly into a vein in the back of the Doctor's hand making sure there was a backwash of blood first. The canola had been ripped out again so they'd have to check he'd not shredded the veins in his arm. His other arm had some nasty looking bruises on it where he'd lost the canola during his nightmare, so the chances were they were not going to match and it was going to look like he had been brutalised.

"The cut on his head is bleeding a bit," Wilfred advised the medic, worried about the Doctor and the way he kept on just screaming. He'd not acknowledged him, but he was hanging onto him so he hoped he was doing some good for him. It just broke his heart to see the man who was so full of life and enthusiasm and who had been so brilliant for his Donna in such a mess. The Doctor was gripping his hand tightly, but as the drugs started to take effect his grip loosened and the blood began to flow back into Wilfred's fingertips. The Doctor's eyes got heavy and started to close as Wilf caressed his head and his cries became less coherent and more subdued.

"Okay, Jack, is there any way you can clamber over the bed and hold the cast on his leg as still as possible to begin with?" James asked. Jack managed to get into position and then Gerald moved the bed back slowly. They had to make sure there was enough space and all the wires were slack and out of the way. The hospital bed was heavy and it had dumped the Doctor over with Private Coates and Wilfred to land on top of him.

"Can I help?" Private Coates asked coming back in. He knew the Doctor had acted to protect him despite everything. He'd been trying to save him from the ghost and had taken the bed over completely to do so and now he was paying for that act.

"Can you get the bed back upright? It will probably take two or three of your to do it because the mechanics underneath the frame are heavy. Then I need you to remove all the framework from above it as that is now useless," James instructed. Coates nodded and got to work.

"You're alright, Doc, we've got you now," Jack assured the Time Lord as he held the Doctor's leg still as the bed was moved back. The Time Lord cried out through the ketamine as the bed no longer held his torso on his side but Jack held his leg still which meant he rotated and twisted slightly.

"Careful," James wanted as he saw the Doctor rock without the bed behind him. "Wilfred, try and keep him on his side for the moment."

"James?" Jack worried as he felt a cool stickiness on his hand when he moved up to get a better grip on the cast from underneath. He looked at his palm and it came back with smears of blood on it. He showed it to James.

"Damn?" James sighed guessing what it meant without seeing it. "Move this bed right out the way now so I can get in please?" he instructed and the bed was dragged on its side across to the other side of the room so that Private Coates could work on getting it upright and getting the mangled metalwork off the top of it. He got a couple of the uninjured soldiers out of the rest room that had been set up so that they could get the bed upright and then he went and found himself a screwdriver and set to work on the bed frame rather than wait to get a maintenance operative down. It was a bit awkward and he almost got hit in the head by a bit of the frame. Major Starkey stepped in to help him do it properly, talking him through proper dismantling techniques that didn't involve braining himself with a cross-bar.

"Okay, very carefully, I need you all to roll him onto his back. Jack, take the weight of his leg please. Gerald, you need to control the roll. Makes sure his arm is out of the way we don't want him to get that all fizzy with pins and needles from lying on it.

"On the count of three then," Gerald instructed. "One, two, three." They rolled the Doctor onto his back.

"Fuck," Jack gasped as they rolled him over and his leg became visible in the cast. He was hoping the blood might have just come from a cut or a graze where the skirting board had dug in but he should have known better.

"No wonder you're hurting son," Wilfred held him with his head in his lap as the Doctor cried out on the drugs as he was rolled back over.

"Now that is a blow," James commented. The pointed end of his upper tibia was protruding a full two inches out of the front of his shin. "A real blow."