A/N: Hey guys! Thank you so much for the reviews. They were all lovely and you totally brightened up my day. I've received a lot of questions about where the 10th Doctor is on his timeline. On one hand, I just want to say 'Spoilers!' and leave you to your theories, but I'll be kind just this once. As far as events go, this is taking place during a time lapse between "Journey's End" and "The Waters of Mars." Donna has left as his companion, and he's already met River Song in the *ahem* library. *wink wink nudge nudge to superlc529 who first noticed*.

So, again, thank you for all your wonderful reviews, you're all brilliant! So as promised, here's Chapter 3 of Echo. :) I hope you guys like it.

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Chapter 3

Lost Time

(11th Doctor's POV)

I could feel the TARDIS shaking from the effects of Amy's unusual departure. Time Surges apparently didn't work well with a machine that lived from the Time Vortex itself. I was doing everything I could remember, everything that was in my power to try and track down Amy's time and location. I had to save her... I had to save her from myself.

"But where is she, I mean, when is she?" Rory was still piecing the puzzle together. I held back an anxious groan.

"She's stuck in my past timeline, with another regeneration of mine."

"What, you mean like... one of your other faces?" He asked, having heard the 'regeneration' speech from Amy long ago.

"Yes, Rory, one of my other faces." I rubbed my forehead and tried to ignore how the stress was beginning to affect my hearts speed. Sweat was beginning to bead on the back of my neck and it felt cold against the heated air around us.

"Are you okay? You look ill," Rory said, concern lacing his voice. I tried not to smirk. His wife had just disappeared in a ray of light and he still somehow found time to be worried about me; the last person he should be worrying about.

An image of Amy looking at me through a glass wall burned itself into my memories and I clenched my teeth against it.

"I'm fine," I lied, feeling the burning sensation spread from my hearts and in my arms and legs. The process is moving faster than usual... I thought to myself worriedly.

More images raced through my head now and I clenched my eyes shut and my jaw tight. The pain was beginning to set in with a cold, pounding ache that reached deep into my bones.

"You don't look fine, Doctor," Rory said, touching my shoulder gently. He meant it to be kind, but it burned instead. I ripped myself away from him and threw myself back to the controls with reckless abandon.

"I can't stop! We have to save Amy!" I shouted, throwing levers and slamming my fists down on buttons, hitting so hard I wished away the pain inside me with every strike. If anything, the pain grew till it was almost unbearable.

"But isn't she with you? The past you? She should be safe, right?"

"No," I groaned out, "If anything she's in more danger than she's ever been in her life." A strangled cry tried to escape my throat and I doubled over. I caught a look at my hands and my eyes widened. They were glowing. No, this is too fast; something's gone wrong...!

"Doctor!" Rory was at my side in a moment, trying to bring me over to the pilot's seat. But instead of welcoming his gentle help, I fought him away, trying with all my might to get back to the console.

"No, Rory! Let me back, I have to keep moving, I have to, I have to-!" I couldn't stop the scream that ripped up from my lungs this time. The pain... It burned. It burned worse than anything I'd ever experienced. It was cold and hot and awful and just burning, burning, BURNING. I felt something warm behind my eyes but I shook my head and blinked hard. No, I refused to cry. I couldn't cry from the pain. I had to be strong. I had to save her. I had to save Amy. I had to save her from myself.

I lunged forward and slammed my fist into a glowing yellow button. The TARDIS shook more fiercely and flung itself deeper into the Vortex. It had locked onto a signal coming from the end of the surge. It was chasing after it, following the path the Surge had left behind.

I crashed to the floor and Rory tried to help me up. The glow on my body was growing stronger, but I couldn't fight any longer. It burned so hot I could barely breathe. My head lolled to the side as Rory tried to pick me up and take me to the medical bay, but I knew it could very well be too late.

I was dying. And there was no way I could stop it because the past was changing every single moment in my life from that day Amy appeared to this one.

And the only person in all of time and space who could possibly save me was somewhere deep in the past, buried a thousand feet below ground in a glass box with two choices. Save the Doctor, or the alternative...

I felt something warm slide down my face and the feeling of a thousand bricks slamming into my chest intensified. I couldn't lose Amy. I just couldn't. Not after everything we'd been through. And I'd be damned if I let her do the one thing I knew she was going to do.

As I saw her reach for the button in my memories, all I could think was "For the love of God, don't press the green button." And that was all I thought as that first and final tear slid down my face.

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(Amy's POV)

The younger Doctor had wandered off to the TARDIS Library to try and look up information on Time Surges. I followed him and sat on one of the many sofas while the Doctor dashed around, pushing ladders back and forth in an effort to find the right reading material.

"No, not Huon particles..." He was mumbling to himself as he put one book back and grabbed another. "Theory and Relativity of the Natural Vortex... Why do I have this?!" He exclaimed and pushed it back in. He then pushed off the shelves to roll the ladder to the side before stopping himself and looking in a new spot.

"So, do I just call you Doctor then?" I asked curiously. I couldn't help myself. Did his different selves call themselves by different names? Or were they all just 'Doctor'. That must be a pain during reunions. I remembered my Doctor's Ganger, and how chaotic and confusing it had been trying to figure out which Doctor was the right one, when they were both simply... identical.

But in this case, these Doctors were completely different. In much more ways than just the physical sense.

"Doctor is fine," The younger Doctor replied vacantly, not seeming to be paying full attention to me. I bit the inside of my cheek and crossed my arms.

"So what, are we just going to look around in this Library until you find something on a Time Surge?"

"Yep!" He replied with a smile, making a small 'pop'ing sound as he said 'yep.'

"Never have I ever heard of something called a Time Surge. I just don't see how it would work. Cluster of energy maybe? But enough energy to latch on to something and transport it through time...! Well, that's just not possible. Oh! Look, something impossible. Brilliant!"

I couldn't see what was so funny, but at least he was amused with himself.

"Say, how old are you anyway?" I asked with a small smile. The Doctor looked absently at a new book and didn't say anything for a moment.

"I'm 906."

"Wow, you are young then, aren't you?"

"Oi! You're one to talk! You with your... What, how old are you?"

"Shut up!" I exclaimed, my Scottish accent thickening. "You don't ask a lady for her age!"

"Oh, I just thought..."

"Thought what?"

"Nothing! Nothing at all." He replied quickly as he clumsily dropped two books. He quickly jumped down to pick them up. I heard him quietly mutter, "Just didn't seem very lady lady..."

"Ohhh, you're lucky I have half a mind to let you go for that one," I growled menacingly. A cheeky smile crossed his lips and I narrowed my eyes.

"Just half a mind?" He asked.

"Oi!" I shouted and tossed a pillow at him. "You-you cheeky...! You little DALEK!" He was laughing at me as he easily dodged the pillows and I crossed my arms across my chest, tucking up my legs as I scowled at him sarcastically from across the room.

The laughter died down soon enough and a comfortable silence fell across the room. I looked at him quizzically and his eyebrows rose.

"What?" He asked curiously.

"Don't you want to know how old you are from my timeline?" I asked. His expression hardened slightly.

"No. It wouldn't be good for me to know too much about my future. It could cause a paradox where I'll try and change my own future, which could set events in order that will hurt others in the process." He made it sound so serious that all the happiness and comfort in the air was zapped cold in a second.

"Oh." Was all I could say. Bundle of sunshine, this one, I thought quietly to myself.

I seriously started to question his sanity when his smile popped back a second later and he was bouncing down the aisles again in search of Time Surge reading material.

"So," He was muttering to himself loudly, "Impossible, impossible, impossible, time surge..." I stood up and walked into one of the aisles and looked up. There were so many books I didn't know where to begin.

It was strange. In all the time I'd spent with my Doctor, he never visited this place much. Ever, actually. I remember Rory mentioning he'd visited this place once. He said it was a bit dark and cold, but as I looked around the air was warm and pulsed with light. I had no idea why Rory would think such a thing about a place as gorgeous as this.

Just like the rest of the TARDIS, the Library was enormous. It stretched on and on forever. The walls were a burnt orange, but in a strange way they glowed with life and seemed to ripple like grass in an unfeeling breeze. Swimming lights seemed to dance above the shelves, shadows of stories and adventures drifting about inside the light particles as they told silent stories to the atmosphere.

I looked closely at one that started to drift toward me and wrapped itself around my shoulders before passing on. I saw images of wrapping tunnels and a glass box. Inside was a control panel with two buttons. Before I could get a better look the light had drifted back up to join the other dancing lights high above the shelves.

"I may have found something!" I heard the Doctor shout. I looked up at where the voice had come from. The Doctor waved at me from the top shelf, his legs swinging as he pointed at three books in his lap.

"These might give us some insight!" He grinned and hopped onto the ladder, swinging down until he landed right in front of me. "Let's have a look shall we?" He asked.

I followed him over to a large study desk that looked more like a dining table made of rubies and marble. The lights seemed to follow us as we sat down, hovering above us as if we were the most interesting story in the room.

"I couldn't find anything specific to a Time Surge, but I found a couple of things that might come close." The Doctor said as he opened up the books and handed me one. "Check the chapter index. Anything look familiar?"

I did as I was told and opened up the book. My forehead scrunched up as I tried to figure out all the technical terms I was seeing. Think, I told myself firmly. What would the Doctor say?

That's when I saw something that sounded exactly like something my Doctor would have said.

"This one?" I asked, pointing to the third chapter. "Radical Time Displacement of Powers or something." The Doctor beamed at me like I was his star pupil. Which, come to think of it, I sort of was learning from the Doctor all the time. Ever since I was a little girl, when I thought about it.

"Brilliant! Yes, that would be it. Now, read through it and see if anything applies to you. I found another book on Space Tsunami's and 'Dimensions of Time and Their Aspects.' Don't know how much good they'll be, but isn't that just the fun of it!"

"I suppose," I replied as he beamed like Father Christmas before pushing on some glasses and digging his nose into a book.

I stared at him for several long moments before I was able to look away from the fact that he wore glasses and looked at my own book.

Most of it was gibberish at first. It was like handing a college level academics book to a five year old and telling them to solve the problem. But the further I got into it, the more it started to sound familiar. Maybe it was from hearing the Doctor use these terms a thousand times, or maybe I remembered it from some documentary. Either way, some of it made sense. Although none of it made perfect sense to my situation.

"'When a rift in Time and Space shatters, fragments are scattered across the cosmos. In doing so, these fragments release energy from the vortex which allows random passages through time if approached correctly. However in this process a fragment can be caught and preserved for an indefinite amount of time before it burns to ashes from the force of its own power. In those few moments that the fragment burns, its energy can be collected as a power source from the Time Vortex which was released through the explosion. With this power, one can create a surgical power which allows one to time travel. Some time travelers use this technology for creating vortex manipulators...'" I nearly jumped in my seat. It said 'Surgical power', otherwise known as 'power surge'. With time energy, of all things.

"Doctor," I said, shoving the book at him and circling the area for him to read with my finger. He pushed up his glasses and took a solid look.

"Well, what do you know?" He mumbled, starting to flip through the pages.

"So, basically it's like a broken vortex manipulator?" I asked. The Doctor nodded mutely.

"Something like that, yeah..." He murmured before stopping. "Yes, very much so like that. It's a strong possibility!"

"So what do we do next?" I asked, that old thrill of excitement building up in me again at the thought of travelling with the Doctor. Or in this case, any Doctor.

He took of his glasses and grinned.

"Find out who's selling unstable vortex manipulators! Allons-y!"

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