Spike and The Doctor were being tosses around the TARDIS control like ragdolls. The Doctor grabbed onto the control the panel, used his magic to lock his hooves to the ground and looked at Dash who had a smile on her face

“Oh you just have to be flying”, he said with sarcastic tone to her

“Well watching you two getting thrown around is pretty fun”, she said with gleeful smile

He then looked at the monitor and saw that they were about to crash into a building.

“Oh course we are about to hit something; I’ll try to prepare for emergency materialization. So we don’t crash”, he told them

He then used his magic and hooves to pull and press a couple of levers and before he could press the last lever, they crashed through the building causing the TARDIS to landsides. On the inside, Dash and Spike land on top one another against the door.

         “Ok let me fix that”, he told them

He pressed a switch and lever casing the TARDIS to materializing vertically, like it should. This caused Spike and Dash to get off out of each other

“You don’t know how to drive this thing do you?”, she asked reengaging her balance and saw  The Doctor and Spike holding on to the console

“You know your mother said to me too once”, he said to Dash , “And you know what I said to her?”

“What?”, she asked with a faint smile of curiosity

“Shut it”, he said going towards her and collecting himself and Spike did the same, “But enough of being rude here.”

 “I welcome you Dash to the past, but first let say this first your cover name is Rainbow Cloud”, The Doctor as Spike approached them, “And Spike your is Thrones.”

“This is going to be awesome”, she said throwing a hoof in the air and Spike nodded in agreement with the Doctor, “But why are we getting aliases?”

“Because if you tell Celestia anything that happens in her future, your time, it will cause I’ll sort catastrophes.”

“Like?”, Dash asked

“Time itself being unravel for one”, he told her, “So ladies first.”

The gang looked around upon the doors and looked around; they arrived in Luna’s throne. The room was almost dark and light from the daytime shaded some the room and there were dust particles in the air. There was also dark blue with moons symbols all around and a throne room and the windows were painted with some Luna’s accomplishments such as getting her cutie mark .

“Oh this is not good”, Spike said closing the TARDIS’ door

“What, it’s just Luna’s room”, Rainbow said

“Exactly, if my TARDIS landed where I think we landed were in the era where Luna is still banished on the moon and by deduction this  room is locked down”, The Doctor explained to them

“Which means”, Spike said as doors slammed open, “Right on que.”

Moments later they were surrounded by Solar Guards

“Halt Intruder”, said one of them

Moments later, the captain of the solar guard went to him

“State who you three are, your intention, and why you broke into a forbidden room in the castle”, he ordered them

“Doctor, Thrones, and Rainbow Cloud ”, he told them and taking out a bag from his pocket, “Fun, by accident, sorry  and can offer you some chocolate?”

“Doctor?”, he said with a surprising look and taking chocolate from his bag  

“Yes, I do believe the princess knows me”, he told him and eating one himself

“Indeed she has mentioned you and few others if you are to arrive, the highest guard, being me, is to escort you and your companion or companions to her ASAP”, he  explained finishing off the chocolate ball and then looked the guards, “Leave us.”

The guards then left the room and he looked at The Doctor and the rest and told them to follow him. As they were walking, The Doctor then thought about the last time he talked to Celestia.

~

50 years earlier

Celestia was crying in her room in the ruins of her castle, it was a little over week since Canterlot was built by her and her mentor, Starswirl. She made sure to build a room for Luna, if she did decide to come back and she did find a way for her to be reformed from that monster.

She then heard a familiar sound she hadn’t heard since before this whole mess begun. She heard this sound, her feelings went from sadness to anger. She turned around and saw a Blue Box not far from where she was laying down. A brown pony then came out of it with a sorrow look on his face as he closed the doors

“You”, she standing up and pinned The Doctor against the wall with her magic, “You could have stopped all of this from happening.”

“I tried”, he said looking at her

“No you didn’t”,she with cold tone in her voice

“I did!”, he shouted with a cold look in his eyes

A knock then came the doors

“Is everything alright in in there, princess?”, a guard asked

“Yes!”, she answered back and then she looked back at the the Doctor “Care to explain?”

“I tried my best to prevent Nightmare Moon from coming into being, even though it was fixed point in time. You see, one year before the Nightmare came I said to check your ego and I kept warning you every week”, he explains, “But you didn’t listen to me and went ahead and ignored her. You, her own flesh and blood.”

She and The Doctor remained in silence for quite some time.

“I’m sorry, but I was caught in my duties and teachings with Starswirl”, she said almost starting to cry , “I should have listened.”

The Doctor then hugged Celestia and she began to cry in his fur  

“You’re the closest thing I have had to sibling”, he said, “Don’t forget that.”

~

The Doctor, Spike and Rainbow Dash entered the throne room. Celestia glanced up from her paperwork and saw them

“Metal Armor”, she said, “Who are these ponies?”

He took his helmet to reveal a gray mane

“Your highness, the dragon’s name is Thrones and the two ponies are Rainbow Cloud and The Doctor”, he explained

“Doctor?”, she asked looking at the blue stallion

“Hello sis”, he said with a smile

Celestia hugged the Doctor while Spike and Dash looked at each other in confused. The Doctor coughed and looked at them

“I should explain, since we are both very old and practically immortal by all means, we look to each other as metaphorical siblings”, he explained

 “But why do you look different?”, she asked with a confused look

“Your highness”, the captain said with a cough

“Right that has to wait until tonight”, she said, “Follow me.”

The Doctor and his companions walked with Celestia to local Canterlot hospital. Where guards were stationed outside on the entrance of the room.  They then entered the bedroom and Doctor and Spike were shocked at who they saw on the bed; Starswirl the Bearded.

“Doctor, I need your help”, she said, “Starswirl is dying.”  

The Doctor took out his sonic screwdriver and scanned him . The sonic  a foot long and was golden and lighted with alot sorts of colors, it represented that close to a rainbow.

“He’s alive”, he said looking at he said looking at his screwdriver, “But barely. A spell is keeping him alive.”

“Correct,Doctor”, Celestia nodded in approval , “Starswirl discovered this life support spell when I was just filly and that spell is the only keeping him from dying.”

Celestia looked down at him and at the Doctor who had stone cold frown on his face

        “I want to save him Doctor”, she bagged

        “I can’t”, he told her

        “Cant or wont?”, Celestia questioned with a growl

        In response to this Spike singled Dash to leave the room

        “Can’t”, he said

        “Doctor”, she growled

        “I’m sorry Celestia as friend once told me, Everything, no matter world or relationship, ends”, he told with cold look in his eyes

        Celestia then stomped her hoof on the ground and she started to cry and the Doctor hugged

        “I’m sorry”, he said to her, “I wish I could do something, but I cant.”

        “I will set up rooms for all three of you”, she quietly, “Now get out!”

The Doctor stopped hugging and  looked at Starswirl and narrowed his eyes and  then left the room. As he was leaving he had his head down and he approached Dash and Spike.

“We need talk,” he said, “In private.  follow me.”

Spike and Dash walked to the castle. As they were walking the building was being watched by couple of hooded ponies in an abandoned house across the street

“Sir when should go in?”, one of them asked

“Shortly”, another one said , “Once our spy signals us I will get back my body because its time.”

The Doctor and others reached the room Celestia rented for them and opened it. The room had 3 beds in from in a circle. Each bed had a white blanket with Celestia cutie mark on it. To left of the rooms was a hallway to the bathroom and to the right of another near the entrance was bookcase with some books nicely organized. Across from the entrance lead into a balcony. The Doctor was about to go onto the balcony.

“Since now we are alone”, Dash thought

“What happen to you Doctor?”, she asked , “Last time we meet you’re a brown earth pony with Derpy now you’re a Blue Unicorn who loves chocolate and is traveling with Spike.”

“It's a long story”, he said looking down

Dash sat down and cross her hooves

“We have the  time”, she said

The Doctor looked at Spike and he nodded and shrugged

“You see me, Dinky …”

“Who’s Dinky?”, Dash asked

“My and Derpy’s artificially created daughter, which another long story, but that’s not the point now. The point is Derpy and Dinky were sent back into the past about 50,000 years ago before your time Dash; they were shopping before all that happen. You see, it was trap made the Dalek who started the Time War, The Time Controller, who  escaped  to this universe . They then went to war with the alicorns.”

         “So what happen to the alicorns?”, she asked as sat down along with Spike.

“As I said, Dinky and Derpy were abducted from their own times to the last year of the Alicorn-Dalek on Aesir.”

“I arrived in the last week of the war and well they changed. Derpy looked like old mare who had seen too much and Dinky well she no longer my daughter, she was now a product of the war;  I meet with last alicorns which included a filly Celestia and a newborn Luna. Their plan was to get to shuttle and take to this planet.”

“So what happen?”, Dash asked

“Our plan was pretty simple, get alicorns off the planet using the shuttle and blow the planet using the bomb that was delivered to the core but there were a couple problems. Somepony need to distract the Daleks. Dinky offered, but Derpy and I refused her offer . The plan in the beginning  was to lure  all the Daleks of the promise of a device that can transformed  any species into anything.”

Spike rolled his eyes as Dash did too

“Yeah I would even pick out it was a lie but the alicorns pulled off it pretty well. There was one problem, the bomb that was planted into the core, it was never delivered, which was the second problem.”

“Why didn’t it get delivered?”, Dash asked

“Short and simple: They were betrayed by a mad alicorn  who worshiped the Daleks. So Derpy offered to take it and I said no because I didn’t want her to leave me and I forced her to stay. The next thing, I knew she left behind my back halfway between the drop zone and the bomb.”

Dash was still interested while Spike went into the hallways to explore for a bit. The Doctor took a minute to collect himself.

“This is where things went from bad to worse. In order for the remaining alicorns to get to the ship. Somepony need to distract the Dalek waiting at the ship. So I offered myself up and they took my to their leader, the Time Controller.  Unknowingly, the there was trap set for my daughter and the alicorns ,it was ambush and there were waiting by the ship. I watched them helplessly defend themselves and Dinky getting everyone aboard. Dinky was shot,but as she was going to regenerate, but  she was shot again. Luckily she bought enough time for them to get aboard the ship getting away from the planet was another matter entirely. This when Derpy took a ship with the bomb on it and told me to get out of there and I ran for the teleport. I got to the teleporter and managed to teleport a mile within my TARDIS. I looked up and saw her ship exploded, and cried so hard and then I was knocked out. I woke up and saw the world around me exploding and I knew I had no time as the toxic fumes and the radiation from the bomb was killing me and it  was painful getting to my TARDIS. I barely managed to get to her and I told her to get out me of here, I passed out, and then I regenerated.”

“I can take it from here”, Spike said

“A couple of ponies found you in the outskirts of Vanhoover and well you woke up, told me you who are, and we went adventures and here we are Dash.”

Dash yawed

“Was the story boring?”, The Doctor ask with bewildered look on his face

“No, but I am mentally exhausted from today”, she said getting to a bed

“Okay good ni—“Spike said, but before he could finish Dash was out and snoring

“My goodness she snores louder than Derpy ”, The Doctor said

Spike chuckled, “Yep. One time when the girls a had a sleepover in the tree house. I had to go down to the lab in order to sleep because of  Dash’s snores."

The Doctor gave serious look on his face

“What are you thinking?”, Spike asked him in a quiet voice

“Last time we were in Canterlot we dug his grave.... ”, The Doctor replied in a similar tone

“And found nothing", Spike finished

“Correct”, he said

“So you suggest that we should investigate Starswirl?”, Spike asked

“Prosaically and maybe will get some answers to who he actually  is”, The Doctor said with an inquisitive look on his face