"There!" The Doctor slammed back the lever as the chord signalling the landing of the TARDIS echoed in the room. "Arendelle, five minutes after you left."

Anna walked cautiously to the door and gingerly opened it. She whirled around, grinning.

"It's summer again!" She strode out of the TARDIS. "Kristoff! I'm back!" came her triumphant voice.

Elsa smiled sweetly as she too stepped out of the TARDIS, looking at her sister running around the courtyard. She turned around to the Doctor standing in the doorway.

"Thank you, Doctor" she said eventually.

"Don't thank me. I am partly responsible for what happened to you today. I brought the proto-Great Intelligence to your room. And because of that, Simeon arrived here when he wanted to kill me."

"But you fixed it."

The Doctor smiled.

"You helped."

"The TARDIS helped as well."

"Yes" the Doctor said severely. "She can be a sentimental old girl sometimes. Apparently she trusted you enough to fix this without disappearing."

"It… she is really… alive?"

"No. She's much more than that. But you can call her alive if you want."

"Are there… others... like her?"

"Until further notice, she is the last of her kind in this universe. All her sisters are… elsewhere."

Elsa blinked and gently patted the blue panels. "So you already knew" she whispered. "I'm sorry…"

"Hello, Elsa! What is this blue box?" came a cheerful voice at waist level.

Elsa bent down to look at a snowy face under a little cloud.

"Hello Olaf", she said. "Nice to see you again."

"It's glad to see you too, Elsa! I had not seen you all morning as you were working in your room!"

Elsa passed a hand over her face. The stack of papers on her desk seemed to have happened ages ago. "Of course, it was only this morning…"

She stepped back.

"Olaf, this is the Doctor. Doctor, this is Olaf…"

"I know" the Doctor said. "I've met him before. You were there, do you remember?"

"Of course but… he's the real Olaf, this time" she said, smiling.

"Hello, Thedoctor. I'm Olaf and I like warm hugs."

The Doctor scowled.

"Uh. Hugs. Fitting for an ice-cream brain."

"I don't have a brain" Olaf answered earnestly. "You don't like hugs, the Doctor?"

"No. Besides, you are a snowman. Is not a warm hug suicidal?"

Elsa turned to the Doctor, her face serious.

"Doctor… who am I?"

"I beg your pardon?"

"Which Elsa am I, now?"

She felt a gentle poking on her waist.

"You… are the Elsa standing in front of me?" Olaf offered hesitantly.

The Doctor smiled.

"That is rather perceptive, for an ice-cream brain. Also, not wrong, and probably not the answer you were expecting either?"

"No… sorry Olaf. But you see… I remember… different things. I remember how things happened when there was nothing in the ice, but I also remember… a few times when there was. I remember not realising I had struck Anna when she came in the ice palace, and I also remember…" Elsa paused, absent-mindedly stroking Olaf's head. "And I remember today, and going there to talk to myself, and… I'm not really sure what happened next, actually. I'm pretty sure I spoke with myself, and I think I also remember from last year imagining a clone of me with a green dress, but I also remember nothing like that happened…" She looked puzzled, smiling faintly. "Oh, I also remember sleeping in Anna's room for a few nights while the window of my own room was getting replaced. I remember this not happening, but this time I'm actually glad it did. It was fun sleeping in the same room again."

"You travelled in the TARDIS. This allows you to remember time that was rewritten. Although, in that case, you were very involved in these events, so your memory is muddled. And since the timeline was fixed before you disappeared, you still remember the original timeline. Nothing exceptional here. Oh, and, since you managed to reject the Great Intelligence, you probably forgot most of what happened while you were under its influence, so it's a good thing you had something else to remember."

"But, Doctor… What exactly happened last year? You said that in this timeline, I yelled at Anna… So… Did I also try to… strike her? Knowingly?"

"This is probably what happened, yes."

Elsa held her head. Before she found something to say, the Doctor spoke again.

"But what is important is what you remember. Time and memories are not always the same thing." He gestured in the direction of the sunny courtyard around them. "Does this look like a kingdom where the queen tried to strike her sister?"

"But it… it happened…So… now I'm someone who could try to… do that. Even if I remember never wanting to do it as well."

"So, you are complaining to have a choice?" the Doctor said severely. "People usually dream to have this kind of choice."

"What? What choice? Striking Anna?"

"No. Choosing who you are. You have two different memories of your life. Time does not contradict either of them. You can choose which one you like." The Doctor smiled without irony. "Is it not great? Being able to choose what happened in your life?"

"But… I did try to strike Anna. It's something that could have happened…"

The Doctor sighed.

"There is something else you may be overlooking" he said, curtly. Elsa looked at him, puzzled. "You do remember our first trip in the future?"

"Oh, of course… But that future will not happen any more, right?"

"No it won't."

"And your friends from London… They never fought the Ice Beasts?"

"No. They stayed warmly at home, eating some criminals. Only Vastra does that" he added, looking at Elsa's shocked expression. "I did tell her she should change her diet. She might remember some of this story" he mused. "Being millions of years old can do wonders for your resistance to time alterations. I'd have to check up on her…" He shook his head. "Anyway. The Great Intelligence planned to take control of you, and through you, freeze the entire world." He looked at Elsa, smiling. "And he succeeded. That's when the Ice Beasts attacked the castle, and winter began to spread to other countries. I can safely that at this point you had stopped resisting it and were completely under his control."

Elsa looked at the Doctor for a few seconds.

"But… this happened… 50 years from now?"

"Yes. That's the time Great Intelligence needed to turn you into his puppet." He fixed his piercing blue eyes on her. "People sometimes wonder how easy it would be to break them. Few get to have an answer before being broken in the first place, and those who do find out it's much shorter than they expected to be." He smiled. "From my personal experience, 50 years is not bad, for a human."

Elsa held his gaze for a few seconds.

"Thank you", she said eventually.

"Are we playing charades?" Olaf asked. He had been looking back and forth at Elsa and the Doctor during their conversation. "Because I don't think I got that one."

Elsa smiled at him. "I'm sorry, Olaf. I'll explain… well, I'll try anyway. Where is Anna?"

"Oh, she went looking for Kristoff. That's a bit strange, because they were walking together not long ago, and she told me Kristoff was leaving for a delivery…"

The Doctor nodded and took a step back into the TARDIS.

"Wait, Doctor!" Elsa called. "Where are you going?"

"I don't know. Somewhere warm, maybe. Or taking skating lessons."

"Is your heart OK, now? The one that was frozen, if you really have two of them" she added, smiling incredulously.

"Yes, thank you." The Doctor raised a hand. "Thawed, repaired, and without any act of true love, whatever your sister may think."

"I don't think I have a heart either" Olaf interjected.

"Yes you do" Elsa said offhandedly. She crossed her arms and cocked her head. "I had been wondering, Doctor. Why did you help us? Before we even knew that it was the voice in the ice… Simeon… who had changed the timelines?"

The Doctor shrugged.

"Why not?"

"You could have simply left."

"That's not my style. I'm the Doctor. I try to help people."

"Even those you don't know?"

"I can't know everyone."

Elsa smiled faintly.

"What?" the Doctor barked.

"Nothing. I was thinking that I know what it's like to want to protect people and not telling them. It also took me time to learn this could also be called love."

The Doctor smirked, then took another step back into the TARDIS.

"Well, your Majesty, it's time for me to…"

"Wait!"

Anna appeared, out of breath, dragging a reluctant Kristoff behind her.

"Wait! Please, Doctor! I just want to show Kristoff the TARDIS!"

"The TARDIS is not a museum exhibit that you can show to anyone!" the Doctor said gruffly.

"But he's not anyone! He's my fiancé!"

"Oh, I see. He's the ice harvester whose live you saved back there. OK, now you saw it. Goodbye!"

"Please, Doctor! I wanted to show him how big it is inside. He does not believe me…"

"You saved my life?" Kristoff asked, puzzled.

"One year ago" the Doctor said. "That's not very nice to forget so quickly your future fiancée saving you from a mind-controlled version of her sister."

"Please, Doctor… Just a quick look! Oh, and I also have to return this coat!"

"You can keep the coat" the Doctor said gruffly, sliding into the TARDIS.

"You're a killjoy" Anna said, pouting. She laid a hand against the box. "Madame TARDIS is nicer than you." She leaned conspiratorially toward the frame. "Thanks for listening to Elsa, Madame TARDIS."

"Doctor, wait!" Elsa said suddenly. The Doctor popped his head out of the door.

"What now?"

"You said what happened today was partly your fault…"

"Yes, but I fixed it!"

"You gave Osmine a ride to London. Could not we just get a ride there too? Just a few hours? We've never been there either."

"Osmine… helped us."

"You said we helped you too! Just a quick trip, to see how it's like to travel in the TARDIS and not end up in Arendelle in the past or the future!"

"Osmine had to be moved away from Arendelle" the Doctor said, looking embarrassed. "Your sister did not remember meeting her for the past year, so I had to make sure the timeline was not altered more than it was…"

"You really are nice to her, aren't you?" Anna said, smiling mischievously.

The Doctor sagged.

"Fine" he said at length. "One trip. Just one trip. And not far from here!"

"Oh thank you Doctor, thank you" Anna said, moving forward as if to hug him. The Doctor backed up.

"No hugs" he said.

"He does not like hugs" Olaf said in an accusatory tone.

"Can Kristoff come? And Olaf?"

"I'm not a transportation service! Your boyfriend and ice-cream brain can wait here! We can be back the instant we leave."

"Come on, Doctor, please? Just to show them how it's inside?"

"They can see the inside, then" the Doctor relented, opening the door and stepping back. He raised a finger. "But they won't travel with us!" he added, looking severely at Anna. "And the elk does not come inside!" he added, pointing at Sven who was ambling by.

The large reindeer looked with puzzlement as everyone stepped into the small box. He cocked his head from one side to another, trying to understand why the box was not bursting after so many people went inside.

Sven walked slowly to the ajar door, just in time to hear the older man shout.

"Don't touch that, ice-cream brain!"

The door slammed in front of Sven's snout.

The ears of the reindeer swivelled as a strange sound filled the air. He jumped backward as a gust of wind hit him.

Under Sven's incredulous eyes, the box became transparent, as the sound slowly receded. Soon there was nothing on the cobbles, while a distant chord died.

Sven brayed a few times, then walked where the box had been, sniffing the ground. It felt as if it had never been there. More disquieting was the fact that this was also the case for Kristoff, Anna, Elsa and Olaf.

Sven looked around and brayed a few more times. There was no answer, apart from curious looks from people walking around the courtyard.

Sven cocked his head. There seemed to be only one course of action available.

The large reindeer sat on his haunches and waited patiently.

Author's Notes: Yup, this is the end.

In my first notes for this story, the villain of the story was going to be the Master, then I found that the Great Intelligence's modus operandi was so well suited to target Elsa that it was too tempting to use him there. Also, I had planned to have a Clara timeclone living in Arendelle from the start, so having Simeon there as well made some kind of sense.

Also, in my first drafts, I intended to simply have the Doctor say goodbye to everyone and leave. Then I realised it was funnier to have everyone leave with him in an open ending. And then it happened that I got the idea for an adventure for all of them… So there should be a sequel to this story in the next months, or maybe next year (and, if not, I'll write a little epilogue to avoid leaving Sven waiting forever). Stay tuned!

Anyway, thanks for reading this story, I hope you liked it!