"Get back!" The Doctor whispered.

"What is it? Who's there?" Derpy asked.

"It's those six ponies from Ponyville. Also Princess Celestia, Princess Luna and Princess Cadence are there too and that dragon, Spike." The Doctor explained.

"Which six ponies?" Derpy asked again.

"Twilight Sparkle, Rarity, Rainbow Dash, Fluttershy, Pinkie Pie and Apple Jack." The Doctor said.

"Oh, you mean the six ponies who possess The Element's Of Harmony." Derpy explained.

"What are The Element's Of Harmony?" The Doctor asked.

"Six element's, honesty, possessed by Apple Jack, kindness, possessed by Fluttershy, laughter, possessed by Pinkie Pie, generosity, possessed by Rarity, loyalty, possessed by Rainbow Dash and magic, possessed by Twilight Sparkle." Derpy explained.

"And what are they for?" The Doctor asked.

"They are Equestria's most powerful defence." Derpy explained.

"Ok, hush now, I want to here what they're saying." The Doctor demanded.

"The one who stole your crown was a unicorn named Sunset Shimmer. She has taken it through the portal." explained Princess Celestia.

"How will I get it back?" Twilight asked.

"You will need to go through the portal to the alternate world and retrieve your Element Of Harmony." Cadence explained.

"Your element has no place in that world that Sunset Shimmer now call's home. You need to retrieve it before Sunset Shimmer use's it." Princess Luna said.

"What will happen if she use's the element in that world?" Twilight asked.

"You don't know?" Princess Luna asked.

"If Sunset Shimmer use's the element in the other world, it could cause serious damage to both world's or even destroy them both." Princess Celestia explained.

"Oh, that make's me feel much better." Twilight said sarcastically.

"But be warned, the portal to this other world opens for a short time ever thirty moon's, you will need to be back in two day's, if you are not, the portal will close and you will be stuck in that strange world for another thirty moon's." Princess Luna explained.

"So that's what made the T.A.R.D.I.S crash, that portal. Derpy, I have an idea, what she need's to do is dangerous, when she jump's into the portal, do you want to go after her and help?" The Doctor asked.

"Another adventure, YES!" Derpy screamed.

"Can you tell me more about this portal before I jump in?" Twilight asked.

"Yes but we don't know much. This portal just doesn't take you to another world, it take's you to another universe! Another planet Earth. This planet Earth, isn't populated with ponies, But with a species called Humanity." Princess Celestia explained.

"WHAT!" The Doctor shouted.

"What does it mean, Doctor?" Derpy asked.

"Derpy, remember when we first met, I said I came from another universe." The Doctor said.

"Yes, I remember." Derpy said.

"Well that's the universe I came from!" The Doctor screamed in excitement.

"So we get to go to your universe?!" Derpy asked.

"Yes, but I cant believe I never knew this portal was here, but I get to go back to my old universe again." The Doctor screamed.

Derpy paused and thought for a moment.

"Yes Doctor, that's good, but you won't stay there forever will you?" Derpy asked.

"What, no, I've lived in that universe for over nine hundred year's. I got tired of that universe, that's why when I landed in this universe, I decided to stay!" The Doctor explained.

"Ok, it's just because I don't want you to leave." Derpy said.

"Derpy, I will never leave you." The Doctor said.

Derpy smiled happily and hugged The Doctor.

"Thanks' Doctor." Derpy smiled.

"Are you ready to go through, Twilight?" Celestia asked.

"Yes." Twilight answered.

Twilight walked forward but she was stopped by Rainbow Dash.

"Wow, wow, wow. If she's going, the rest of us are going." Rainbow Dash said.

"You cannot go!" Luna said.

"Why not?" Rainbow Dash asked.

"If to many of you go through the portal, it could cause more damage, making it impossible for Twilight to complete her mission before she has even started." Celestia explained.

"Oh, Ok." Rainbow Dash sais sadly.

The other five ponies moved out of the way so Twilight could go through the portal. Twilight walked through the portal with a blinding light, the light faded and she was gone.

"Now we play the waiting game." Pinkie said.

"Come on ponies, let's go back to the main hall, we've got thing's to catch up on." Celestia said.

"Quick get in there!" The Doctor said.

The Doctor and Derpy hid in a closet, Princess Celestia walked past with the other ponies and walked to the main hall. The room with the portal was empty. The Doctor and Derpy ran out of the closet and into the room with the portal.

"Are you ready?" The Doctor asked.

"Always." Derpy replied.

The Doctor and Derpy ran through the portal together.

"GERONIMO!"