"I don't know who she's arguing with. Let's get closer and see if we can listen in on the conversation." The Doctor said.

The Doctor and Derpy walked closer to Twilight to hear the argument. They had become spectator's of the argument.

"Don't you talk to her that way!" Twilight screamed.

"I'm Sunset Shimmer, I practically run this school and there's nothing you can do about it." Sunset Shimmer said as she ran off in a rage.

Twilight walked over to the one Sunset Shimmer abused.

"Are you ok?" Twilight asked.

"Yes, I'm fine, Sunset Shimmer and be really mean." The pink haired person said.

"Sunset Shimmer, so that's who is causing all of this disturbance." The Doctor said.

"That's Sunset Shimmer, hmm, getting the crown back will be easier that I thought. What's your name?" Twilight asked.

"Fluttershy." she said.

"Fluttershy?" Twilight asked.

"I know, it's a strange name." Fluttershy said.

"No, it's not a strange name where I come from, I have a friend called Fluttershy!" Twilight said.

"Where do you come from?" Fluttershy asked.

"It's hard to explain." Twilight said.

"Oh, Well do you want to get lunch with me?" Fluttershy asked.

"Sure, why not." Twilight answered.

Twilight and Fluttershy left the corridor to go to the cafeteria. The Doctor and Derpy fallowed them.

"Remember, keep your distance, I don't want Twilight to know we're here." The Doctor said.

After lunch, When the school day was almost over, The Doctor and Derpy started to follow Twilight again.

"Ok Spike, we need somewhere to hide!" Twilight said.

Spike saw a sign post the school library and got an idea.

"How about you stay in the school library tonight." Spike suggested.

"Good idea, Spike." Twilight said.

Twilight and Spike followed the sign post's to the library. Derpy and The Doctor were going to follow but they stopped when they heard a noise coming from one of the class room's. The Doctor and Derpy went to investigate. They walked into the classroom and heard a noise from the ceiling.

"Who's there!?" The Doctor shouted.

Suddenly a body feel from the ceiling leaving a huge hole. The mysterious man looked up.

"Oh no." The Doctor sighed.

"Doctor, who is it?" Derpy asked.

"Should of known, I find something strange inside a school and you pop up out of nowhere, Doctor!" said the man in the black cloak.

"Long time, no see. Derpy, this is Captain Jack Harkness, he used to travel with me sometimes when I lived in this universe." The Doctor explained.

"Nice to see you, Doctor, and who might you be?" Jack asked.

"I'm Derpy Hooves." Derpy said.

"Nice to meet you Derpy and might I say looking good ma'am." Jack said.

Derpy's cheek's started to glow bright red.

"Not now captain. Derpy be careful around him, he try's to flirt with every girl he meet's." The Doctor explained.

"I was just saying hello." Jack moaned.

"Sorry." The Doctor said.

"Anyway, I want you to explain a lot of thing's to me, and then you can also explain why you're here." Jack demanded.

"What do you mean?" The Doctor asked.

"Well for a start, I kept calling the T.A.R.D.I.S and you didn't pick up, I tried about one hundred time's." Jack said.

"Yeah, you know I rarely answer my phone." The Doctor said.

"And from my base, I done a universal search for you, no trace of Time Lord or Time Lord technology." Jack explained.

"Oh sorry, my bad. you see, I had an accident with the T.A.R.D.I.S and I flew into another universe, there was some trouble there and I helped get rid of it, after I done that, I took a shine to that universe and decided to stay. And in that universe, I met Derpy." The Doctor explained.

"Without telling everyone." Jack said.

"Sorry, I forgot. Anyway, that universe isn't what you would expect, there is another Earth, but it has magic and there are to princesses that control the night and day, also, it is not populated by human's, it is populated with ponies, there are four type's of ponies, Unicorn, Earth Pony, Pegasus and Alicorn." The Doctor explained.

"Weird universe. You say you met Derpy in that universe, does that mean she's a pony to?" Jack asked.

"Yeah, I'm a Pegasus! It took me a while to get used to the human form when I came through the portal here." Derpy explained.

"So you're a pony, im talking to a pony?" Jack asked.

"You sure are!" Derpy smiled.

"The body form's change when you go through the portal, if you're a pony in that universe and you go through the portal, you become a human in this universe and if you're a human in this universe, you become a pony in that universe. We also know if you're a dragon in that universe, you become a dog in this universe, and if you're a dog in this universe, you become a dragon in that universe." The Doctor explained.

"Can I check that universe out when I'm down what I'm doing?" Jack asked.

"I don't see why not." The Doctor said.

"Oh my god, thank you!" Jack smiled.

"I will have to take you back to this universe in the T.A.R.D.I.S." The Doctor explained.

"That won't be a problem." Jack said.

"Ok, now to other thing's to explain, why are you here back in this universe?" Jack asked.

"Somepony kept jumping through a portal to this universe from that universe with the earth populated by ponies. That somepony who kept doing it was originally from Equestria." The Doctor explained.

"What's Equestria?" Jack asked.

"it's the most powerful country on the planet in that universe, It's also the biggest and the best one on the planet in my opinion, it's where I stay in that universe and it's also where Derpy is from." The Doctor explained.

"Oh, and why is this somepony doing it?" Jack asked.

"She's doing it for a crown from that universe, a pony was transformed into an anicorn princess, Princess Twilight Sparkle, she was given a crown, but it's not just a crown, it's an weapon that Equestria uses for defence, without it, Equestria is left without it's most powerful source of defence. It is an Element of Harmony and it work's with five other element's that five other ponies possess. It is also an energy source, and if it is used by the pony who stole it in this universe, the outcome could be so powerful, it could destroy both universe's." The Doctor explained.

"Do you know who's doing it?" Jack asked.

"A pony named Sunset Shimmer, we also know the owner of the crown, Twilight Sparkle, she went through the portal after Sunset Shimmer to retrieve the crown, we came after her to help twilight get it, but we cant be noticed by her. Do you get it now?" The Doctor asked.

"Yes! I do." Jack said.

"Now it's your turn to explain, what are you doing here?" The Doctor asked.

"It's funny because I found out there was a power source here too, I figured I would come check it out." Jack explained. "And you said there was some type of portal to this universe, did you say?"

"There is a portal connecting the pony universe to the human universe, it only open's every thirty moon's, so me Derpy and Twilight need to be back to Equestria before the end of tomorrow." The Doctor explained.

"Ok, so we are here for the same reason's for the power source and since I'm coming back with you, can I help find the crown with you?" Jack asked.

"Yes, but remember, Twilight cant know we're here. Got it?" The Doctor asked.

"Yes." Derpy and Jack said.

"Ok, good, Twilight said she was staying at the library for the night, so that is where we're going. Come on, let's go." The Doctor said.

The Doctor, Jack and Derpy left the class room and headed towards the library.

"Doctor, you know how you said Jack used to travel with you sometimes. It make's me wonder, how many companion's have you had in this universe?" Derpy asked.

"A few, not a lot, but a few." The Doctor said.

"The Doctor has had many companion's over the year's, he find's you and begs you to come along for the ride." Jack said.

"Hey! I'll have you know that The Doctor didn't find me, I found him in the forest outside of town and we helped stop Nightmare Moon together when she returned." Derpy said furiously at Jack.

"Sorry." Jack said.

"It's ok, I forgive you." Derpy said.

"Look, there's the library up ahead." The Doctor said.

The Doctor, Derpy and Jack ran towards the school library.

"Remember, Twilight is in here and she's staying for the night and so are we. Make sure she doesn't see you when we go in." The Doctor said.

Jack and Derpy nodded their head's.