"Oh am I glad to be back on this planet?! Or solar system... are we even in the solar system?... whatever we're on." I flip off the TARDIS. "Last time I'm going to have to fly this thing. I think I'll miss it." I pat it comfortingly. "Thanks for the ride, old girl."

Jack grins. "Ready to go save the Doctor once again?"

"Oh more than ready." I watch as he pulls out two sturdy looking guns. "Before I kill him again. What are those?"

"Protection." He throws one at me. "I know the Doctor doesn't like killing things or carrying guns - but they're just for safety precautions. We've come so far, we can't risk compromising everything now. You know how to fire, right?"

"Nope." I strap one on, feeling really military-like. Man, it's so heavy. "But I'll figure it out. And I don't think I'll be shooting many things anyway. I'll leave that to you. Let's go save whatever's happening down there, and then I want an explanation for everything. And it better be a damn good one, too."

Jack smiles widely as I cock the gun then step out confidently. There's no sign of life anywhere. I don't feel particularly like shooting anything anyway. Not right now. In this mood I probably wouldn't hesitate to shoot anyone.

"Nice to see they've left us alone." I say wryly.

"Looks like they've evacuated the place." Jack looks around. "I wish I had an explanation for all of this."

"So the plan - we have to find the Doctor, and then figure out what's happening. It will stop all the events that are going to happen... from happening. And thus, create the future as we know it. Safe, secure, and wonderful." He says breezily.

"Aren't we not supposed to mess with the past?" I ask. "Isn't the future sort of mean to be... a secret?"

"But this isn't the past, is it? He says with a dazzling smile. "It's the present. And it'll be our future if we don't fix it. Time lines are comlicated. Set points in history, like the Titanic, World War I, World War II - they can't be messed with. They can't be stopped. Just think what would happen if there never had been any world wars. Think what would happen if people hadn't died - other people hadn't been born. We might never have had the likes of Benjamin Franklin, Thomas Edison... Einstein... and those events we can't mess with. But these, these events aren't fixed. They are alternate." He sighs. "I know it's hard to explain, and I doubt I'll do a better job than the Doctor. "But just know, that he sees what he has to do. He can feel the universe turning. Every event he sees he can see the fixed ones and the alternate ones. He knows what events are fixed - what events aren't. That's why you just sort of have to trust him with these things. Let's go!"

We turn down a complicated maze of corridoors. I buzz open the doors, and we race straight through because there is literally no one around. No sign of life, just us, racing like crazy people through the dark caves with a beeping sonic screwdriver.

I pull up before a door, panting and sonic it open. There's immediate fire. I duck backwards and Jack pushes in front of me, shooting the thing that shot us first. "All clear." He pulls me into the room, which looks like some sort of control room. There's a door on the other side which I immediately pull open.

"Hey, there's nothing in here either." I pull my head back in. "Jack?"

I'm just in time to see an Endor shooting a beam of red straight through Jack's heart. "NO!!!" I fly to his side, bending down beside him. He chokes, then reaches for my hand. "Don't... don't worry. I c..." He chokes, trying to tell me something. "Find the Doctor."

"I can't leave you." I say, voice wavering.

"You have to." He says weakly, then slumps backwards.

"RIGHT! That's IT!" I swing the gun on the floor. "I've had it with everyone dying! Parley? Is that a word in your language?"

"You will be taken to our leader." The Endor says with a nod. It grabs my arms, securing them behind my back and pushes me towards the door we just came out of. I take a look behind me and see Jack sprawled out on the floor.

I don't even have time for feeling sad before I'm shoved into what looks like a central control room. A huge glass panell shilelds the front, and from it I can see a few dark shapes whizzing past. "What is this?" I ask. "What the heck are you doing?"

"The Endor planet is a gateway, a sort of - motorway to the other realms. The Doctor was trying to help us seal it. But we have failed." The Endor bows his head. "The generator shut down before we could boot it up again. And now, the Daleks - all of the other races will flood into your world and destroy everything."

"WHAT?!" I turn around in his grip, struggling. "Where is the Doctor? LET ME SEE HIM!" The Endor turns me around, and I gasp. Lying across the corner, in something of a glass cage is the Doctor. I cover my mouth in horror. He's just... lying there."

"What have you done to him?!" I try to wrench free but the Endor only tightens its steely grip.

"Silence, human. It could not be helped. He was helping us fight against the bridge, but it is too late. We must teleport from this planet before it too his destroyed. Leave her." He points to a smaller Endor.

The small Endor bows to its master and grabs me, pulling me backwards against the wall and securing my hands against a pole, so I'm now sitting on the floor with nowhere to go. "You can't just leave me here!" I wail. "At least take the Doctor! Please! He can help you all! He can't... he can't die!"

"Didn't you know?" The Endor pauses, looking at me bitterly. "The Doctor can be killed - if he is killed before his regeneration."

"NOO!" I scream, wrestling against the bonds, but they're too tight.

The door slides shut, leaving me alone in this cave like room with the machine still beeping feebly, like it's trying to cling to life, and Dalek, weird alien looking things and other races speeding through the tunnell before my very eyes.