*Author's note*

Okay so this was the FIRST 13TH Doctor fic that I wrote and it is according to my tumblr users the BEST 13th doctor fic they've read, so everyone get your fingers ready cause I wanna know what you all think of this. I hope you all like this fic and give it a shot and next up I'm gonna post up another doctor who fic but we're gonna step back and go around to Matt Smith's era of Doctor Who. Hope you all enjoy this fic :)

_______________________________________________________________

It seems I can never make her mad. Ever since the regeneration, my dad or well I guess I should call her my mum, her personality has changed drastically. She's always so optimistic and happy and she never seems to get angry, so I've been wondering what it would be like to see her really angry.

I remember the last couple of times back when my mum was still my dad and anytime I did something bad, he would get mad at me but in the end still forgive me because he loved me. Well he didn't do it as much in his last form because he was a grumpy grandpa but he still forgave me in the end.

Now I have tried to see what it would be like to see my mother get mad, I know not a typical kid thing to want to do willingly but I'm not like any other kid, my name is (y/n) and I'm the Doctor's daughter. I came into this world at my father's 10th cycle of regeneration and since then we have had some pretty wild adventures, but my life got even wilder when my dad soon regenerated into a woman.

It was a bit odd having to call my dad my mum now but I soon adapted and she's pretty cool to be around. But back to my dilemma here. I have tried various different things like accidentally breaking some of my mum's things, trying to grab the controls of the TARDIS, even tried hiding some of Ryan's, Yaz's or Graham's things.

Of course it got them mad but never my mum, which I found odd because she'd just rub it off and say it was just a little game we'd like to play. Which is true, but lately it hasn't been as fun anymore.

So now I am currently just sitting along a hill by the Loch in Scotland 1548. While my mum and the others went off to do a case about some Zygons, I'm stuck here by myself because now that the Doctor is now a mum now, she's ordered me to stay near the TARDIS. I never get to go on adventures anymore and it sucks.

It really, really sucks. And it's boring.

All I do now is pick at grass, kick rocks or hang out in the TARDIS, depending on when and where we were at. So since we were in Scotland I was picking at the grass enjoying the view when I heard something behind me. I stood up and looked around seeing nothing for miles except for the TARDIS.

Now I may appear to be six years old but I've taken the shape of an adult before in my lifetime, and I knew that something was wrong. I kept looking around trying to see if anything was out of the ordinary when I felt something prick my neck. I let out a groan before suddenly feeling very sleepy.

I tried to stay awake but I soon collapsed on the ground and I tried to fight whatever it was that I was drugged with by drawing in a patch of dirt a quick message before my vision went black.

When I finally woke up, I found myself in some sort of window-like cylinder cage. I pressed my hand up to the window and took it back as it felt ice cold to the touch. I soon found myself shivering as I feel nothing but freezing cold around me.

"You finally awake." A dark voice said. I looked up and through the cage I saw a familiar suit of armor standing before me.

"Y-you......you're him aren't you? Tzim-Sha.....the assassin."

"And you are the spawn of the Doctor" he said.

"That's insulting I'll have you know!"

"SILENCE!!" He banged the cage which made me flinch. "You are the Doctor's one weakness. She will pay for everything that she has done to me, once I deliver to her your frozen corpse."

"You w-won't win. My mum's clever, she will find me." Tzim-Sha said not another word but walked away and I heard the doors seal shut leaving me in the dark and my cage became colder. I shivered as I huddled myself tighter into a ball as I muttered, "I hope."

*3rd Person POV*

After solving the Zygon issue, the Doctor and her companions traveled back to the TARDIS that stood on the hill where (y/n) was supposed to be waiting for them.

"Well done gang, another timeline saved again. Now what shall we do next?" the Doctor asked.

"Umm Doctor where is (y/n)?" Yaz asked. The Doctor looked around to see that her daughter was no longer where she said she'd be.

"She might've gone on a little hike around the Loch, maybe a swim. She's always been a fan of water that one has. I'm sure she's fine." The group walked around calling (y/n)'s name but after a few minutes, she hadn't shown up.

"I don't think she's in for a swim Doctor." Ryan stated.

"Okay, okay think, think, think, think, think, if I were my girl where would I go? Yaz, Ryan check the TARDIS maybe she went in there after a while. Graham you're with me we'll keep looking out here."

"Hey, don't worry Doc, we'll find her" Graham assured her and the Doctor nodded saying.

"Yeah, yeah we will. I'm sure we will. Okay team, move out." The Doctor went walking with Graham while Ryan and Yaz went inside the TARDIS to see if (y/n) had gone inside and was taking a nap or something.

Outside the Doctor and Graham were keeping an eye out for anything suspicious or a sign of (y/n). As the Doctor walked, she suddenly felt a dent in the earth. She looked down to see the grass was pattern down, almost as if someone was sitting here for a long period of time.

"Graham I think I might've found something." She quickly pulled out her sonic screwdriver and scanned it and looked down at the readings. "My daughter sat here!" She crouched down and then got a closer look to see foot impressions. "She stood up. And began pacing. But why? Why would my girl be pacing?"

"Uhh Doctor, I think you might want to have a look at this." The Doctor looked up to see Graham standing near a patch of dirt. She raced over to him and together they saw a message being written out in the dirt, but due to the messiness of the writing, it didn't look good.

"Oh no...." The Doctor knelt down and she gently stroked the dirt and she said. "This is (y/n), I know of it. Years ago we'd came up with this coder that if either of us had been ambushed or drugged, we'd write a message in a patch of dirt or soil. But who would kidnap her? Who has my girl?"

"I think I might know, look familiar?" Graham held out what appeared to be a human tooth.

With that the Doctor saw nothing but red.

"So Tzim-Sha's back? How did he find us?" asked Yaz.

"And why would he want your daughter?" asked Graham.

"I think it's obvious isn't it? Revenge?" stated Ryan. The Doctor didn't answer, only kept looking at the tooth that was in her palm.

"But where is he keeping her, that's the question, I mean he could be anywhere in the entire galaxy, or any timeline if he wanted to." Ryan said.

"Time.....Time....Time! Ryan you're a genius!" The Doctor proclaimed as she sat up and raced towards the main controls of the TARDIS.

"Wait what do you mean by time Doctor?" asked Graham.

"Tzim-Sha first came to Earth for his competition but disregarded the rules, right?"

"Right" they all said in confused unison.

"So what better place to go to than where it all began?"

"So wait, he has her trapped somewhere back in September?" asked Graham.

"Yes! All we need to find out is where he's keeping her at. Alright gang, hang on tight!" The Doctor then flipped the switch and the TARDIS activated and soon they went back in time to the day where Yasmine, Ryan and Graham first met the Doctor.

Once they were back home, they all left the TARDIS and the Doctor said.

"Now remember, we're all first trying to figure out what exactly Tzim-Sha was planning, so I want all of you to be extremely careful that you don't run into your past selves. Because if you do well—"

"Don't worry Doc, we've seen Back to the Future we know about the whole 'not seeing yourself past or future'."

"Did those movies also mention that if you do it will not only cause a mess of the space time continuum but also that it could ruin the fabric of reality itself causing unimaginable natural disasters and ultimately and quite possibly changing the human race as we know it?"

"Not necessarily, just the space time continuum thing." Ryan said with fear in his voice.

"Well, nice to know they've toned it down. But no worries, so long as we try not to cross our past selves, especially mind. Ohh I would not want to see myself first starting off, I was a bit off the head wasn't I? Okay gang, let's go find my daughter." With that they began to track down the Doctor's daughter.

*My POV*

Back with me, my body was shivering hysterically. Even with my regenerative powers, it felt like something was blocking it, ultimately stopping me from keeping warm. Whatever Tzim-Sha shot me with, it was most definitely doing the trick.

Oh mum......please wherever you are......hurry.

*3rd Person POV*

As the Doctor kept searching for her daughter along with her companions, when suddenly the Doctor stopped and felt freezing cold. She began to get flashes in her head seeing her daughter. Her body felt colder and colder and colder and nothing could stop her body from almost shutting down.

Next thing she knew, Yaz, Ryan and Graham were standing over her and Yaz said.

"Doctor, can you hear me?"

"W-what...." she asked.

"Take it easy Doc, you suddenly blacked out and you were freezing to the touch." Answered Graham.

"What happened Doctor?"

"My daughter, my (y/n) I saw her she was....." she panted heavily as she sat up and could still feel the coldness that had suddenly attacked her. "She was—in this cage and it.....it kept getting colder and colder by the second. Oh God, wherever Tzim-Sha put her she can't regenerate her body heat. She's gonna die!"

"Don't worry Doctor, we'll find her." Assured Graham. "Now let us think, Ryan, Yaz and I know this terrain better than anyone, so let us do the thinking for now. Alright Yaz have you ever on your police runs gone to somewhere very, very cold?"

"Well on my traffic stops there are a couple of places I can think of.....wait! I remember something!"

"Spit it out Yaz what is it?" Ryan said.

"I remember a safety violation of an old butcher shop just down town. Said the freezers were deemed unsafe as they would keep going on the fritz and making the meats almost too frozen to even keep. Health department and the station shut it down and had the owner arrested for safety violations and health-related issues."

"You think he's keeping her there?" asked Ryan.

"It's our best bet great work Yaz. Now where is it?" the Doctor said.

"Come on it's not far from here actually." They all soon took off running with the Doctor running right ahead.

Once they reached the butcher shop, it still had on the health department signs of closure but that didn't stop the Doctor.

"Alright everyone, take these. If you find my daughter make sure you put this on her, it's an automatic body heater. Just attach it to her neck and it should go to work and help her warm up. If you come up upon Tzim-Sha. Do not engage. I repeat, do not engage. Leave him to me." The group nodded then they all split up and went their own ways in order to find (y/n) faster.

As the Doctor walked along trying to find her daughter, every once in awhile using their telepathic connection, but when she got no answer she began to get worried. After walking through the shop for a few more minutes, she suddenly came across this clear crystal-like cage that was fogged up due to the coldness of the shop.

She went up to it and used her sonic to scan the cage or whatever it was that she was looking at. She then looked down at it and muttered to herself.

"Ventalized crystal cage. Able to take in the surrounding temperature and bring it to the inside so that whomever is in there feels whatever temperature its surrounding area is. Never thought I'd see one in real life." She looked around the cage until she saw an unfogged area of the cage and inside she found her daughter. "Oh (y/n)! Oh love I'm here, Mummy's here now I'm gonna get you out!" She tapped on the cage hoping to see a reaction of her daughter but there was nothing.

(Y/n) remained motionless.

"Oh sweetie don't do this to me. Just hold on mummy's gonna get you out just hold on a little bit longer!" She used her sonic, hoping and praying that she would be able to unlock the cage but she wasn't having any luck.

"You've come at last, Doctor." At that moment her body tensed up, not with fear or her usual demeanor, but pure rage at the voice that was now behind her. She turned around and sneered.

"This time you've gone too far Sha, threatening the Universe and the rest of the galaxy is one thing. But when you involve family—oh you do not want to know the last time someone tried to harm my daughter to get to me."

"I'm well aware Doctor. But interference with a God requires payment on your part."

"You were never a God to the Uxs. So stop pretending to be one now. Release my daughter or I promise you things will get messy" the Doctor sneered.

"That a threat?" Tzim-Sha taunted.

"A promise." She swore. Tzim-Sha then pulled out a gun and aimed it right at her while the Doctor aimed her sonic at Sha.

The two of them keeping aim at each other like two gunslingers in an old Western movie, not a single one of them moving until the draw.

When Graham, Ryan and Yaz came into the same part of the shop that the Doctor was in, they saw her trying to revive her daughter.

"Yaz come over here and help me, I've tried doing CPR but I don't think it's working!" The Doctor said frantically. Her nursing instincts took over and she sat beside the Doctor and pressed her ear to (y/n)'s chest.

"Okay starting compressions." She then began to apply pressure on her chest four times before checking a pulse. "Still not getting a pulse."

"Oh come on love, come back to me. Come to mummy darling."

"Gonna try again," Yaz continued with chest compressions and this time gave (y/n) mouth the mouth. Suddenly she started coming around as she began coughing and shivering. "She's alright!"

"Oh! Oh that's my girl! Oh that' my good girl, that's my good, good girl!" The Doctor praised as she took her daughter in her arms and wrapped her up with her coat.

*My POV*

Back in the TARDIS, I was now bundled up like a bug in a rug with my mum sitting over me.

"How're you feeling darling?"

"A bit warm, and too constricted." I whined out. My mum laughed softly and she said.

"Well it's taking longer for the body heater to work, now that we know since Sha shot you with Black-shade poison to slow down your regenerative abilities." She said as she stroked my hair.

"What did happen back there mum? I mean.....from what Yaz and Ryan were talking about Sha was gone when they got there, what did you do to him?"

"That's a story best saved for another time, right now you should get some rest. Get warmed up, I'll bring in a nice hot chocolate later eh?" I nodded and she gave me a kiss before leaving my room.

What the Doctor never wanted anyone to know was back there at their confrontation, she first dodged the shot meant for her and allowed him to shoot the cage which cracked it just enough for the Doctor to destroy the rest of it.

What she did next was then activate an old storage locker and disarmed Sha's gun before finally giving him a strong punch across the face and a kick to the chest which sent him into the locker. She made sure that the door would remain locked forever and even turned down the temperature to the lowest degree possible and as she stared at him through the small mirror she told him a final promise.

"I told you, you've crossed the line once you involved my daughter into your plans. Let this be a permanent lesson for you Tzim-Sha. Never cross me and my daughter ever again."