"Finally, the rain stopped!" said The Doctor as he left his shelter: the shadow of a giant mushroom. "Now, where Twilight and the others may be? I mean, IF they're here! This is why I deslike dimension travels with company! You may end up in different dimensions!"
After a few minutes trotting (and a big monologue), he came to a halt after seeing a blue box in the horizon.
"Finally! I'm coming, my dear!" he said before galloping toward the time machine. Once near the TARDIS, he braked, a surprised expression in his face as he saw another blue box next to the first bue box. "Two TARDIS? Did the future me went back in time? Well, if I landed so near my TARDIS, I must be desperated to talk to myself! I mean, not like I am doing right now!" he shook his head. "I have to stop that!"
He trotted toward the two TARDISs and knocked on both doors.
"Hello? Doctor? Which TARDIS is mine and which is yours? I mean, both are mine somehow, but... Well, you got it!"
The door of the TARDIS on his left was opened by a purple unicorn, who seemed surprised.
"Greeting, Twilight Spa-- You're a colt!"
"Yes! I am! Always have been! Who are you?"
"I suppose that's not the future me's TARDIS! Unless something happened and Twilight turned into a colt with no memories of her mare self! Anyway, I am The Doctor!"
"The... Doctor?"
"Yep! That's me!"
"Um... Doctress! Come here for a second!"
A brown mare joined Twilight's male lookalike on the TARDIS's entrance.
"Hello there, good fellow! I am The Doctress!"
"The... 'Doctress'?"
"Yes! And before you ask, it's--"
"...'just The Doctress', right?"
"How do you--"
I am The Doctor!"
"Well, that explains the second TARDIS!"
"Why are you here?"
"The TARDIS! He brought me here!"
"'He'?"
"I bet yours is a 'she'!"
"Ding, we have a winner!"
"And why are you here?"
"Travel accident! By the way, have you seen my companions?"
"I'm afraid not! We just arrived a moment ago, this is the first time these doors were opened!"
"It's ok!"
"But maybe we can help you" Dusk! Jack! Blitz! Lucy! 'Scotch! Berry! Out of the box! Now!"
Six colts got out of the TARDIS: two earth ponies, two pegasi and two unicorns (one of them clearly not pleased with the fact of being called "Lucy").
"Doctor, meet Rainbow Blitz, Elusive, Bubble Berry, Butterscotch, Dusk Shine and Apple Jack!"
"You all look like my companions, except for the fact that they are all mares! Rainbow Dash, Rarity, Pinkie Pie, Fluttershy, Twilight Sparkle and... No difference here, still Applejack!"
"Who's this dude, doc?" asked Rainbow Blitz.
"He's me! Well, kinda! He's me from a parallel universe! And he got separated from his companions, who are you from the same parallel universe!"
"Lemme guess!" said Apple Jack. "Ya want us to help 'im find 'em!"
"That is correct!"
"We can help!" said Elusive. "As long as I don't have to step on the mud!"
"Afraid to get you pretty shiny coat dirty, Lucy?" teased Blitz.
"It's ELUSIVE, for pony's sake!"
"Whatever!" Blitz shrugged. "There's a group of mares out there that needs our help! We gotta hurry, let's go!" he flapped his wings and took off.
The other five galloped away in different directions, leaving The Doctor and The Doctress alone.
"hat do e do now, doc?" he asked.
"Care to help me finding a way back to our universes? To Time Lords think better than one!"
"I agree!"

Rainbow Blitz flew as high as he could, looking around. Didn't took too much time for him to see a blue and a rainbow trail, moving side by side with a great speed.
"Gotcha!" he said before diving the sources of the trails, soon catching up with them. The first to notice the new flier was Sonic.
"Hey there!" he greeted. "Friend of yours, Dash?"
When she sa the rainbow colt, she slowed down and landed. Blitz did the same and Sonic stopped running.
"Who... Who are you?" Dash asked. "You look-"
"...like you, I know! It's because I'm you!"
"What?!" the mare and the hedgehog said at the same time.
"I'm not very sure either, but that's what The Doctress said! Maybe if you come if me we can--"
A fireball passed between them, missing the pegasi by mere inches.
"Whoa!!" they jumped back, then looked to the source of the attack: a purple cat.
"Blaze!" Sonic said, smiling.
"Stay away from them, Sonic!" she said, preparing another attack.
"What's going on?!" Rainbow Dash shouted.
"Don't play dumb with me! One of your kind attacked me!"
"What?!" the three speedsters said in union.
"Now hold your horses, babe!" said Blitz. "My friends wouldn't attack anypony with no reason!"
"Neither would mine!" added Dash.
"Well, a robot pony attacked me! First I thought it was related to Eggman, then I saw these two! They're clearly related!"
"Robot ponies?" asked Blitz.
"You don't think...?" asked Dash.
"But they were defeated!"
"Looks like they're back! And in this universe!"
"What are you guys talking about?" Sonic asked.
The rainbow ponies sighed and spoke at the same time:
"Cyberponies!"

The door of the base opened. Charmy was the first to enter, followed by Vector, who was carrying a white pony with purple mane and tail.
"Hey, Espio! Look what we found out there! A unicorn! And a fancy one! I never thought I'd see the day when horses would climb tress to avoid getting his hooves covered in mud!"
"Actually, I'm a pony!" the white unicorn said. "And thanks for the ride to a safe place, fellow crocodile!"
"No problem!" he said, then dropped the pony on the floor.
"Ow!" he grunted as he hitted the ground. "You're very kind, but a little reckless, aren't you?"
"Not another one..." Espio said, facepalming.
"'Another one'? There are more?" asked Charmy.
"Rarity!" Espio called. "I think my friends found one of yours!"
Another white unicorn joined them. It looked a lot like the first one, but it was female.
"I'm coming! Who have you foun--" she stopped talking as her jaw dropped. The male did the same. "Why do you look an awful lot like me?"
"The Doctress said that you would look like us, but I didn't thought it would look THAT much!" he said, surprised.
"Who are you?"
"According to The Doctress, we're the same pony from parallel dimensions!"
"You're me from a different dimension?" she asked, smiling and clopping her hooves together. "Oh, joy! Finally somepony who I can talk to about fashion design!"
"Y-You're a fashionista too?" he smiled as well.
"Of course I am, darling! Same pony, different dimensions, remember?"
"Oh, yeah, of course! I think we have a lot to talk about, dear!"
"I am Rarity!"
"My name is Elusive!"
Vector coughed to get their attention, what worked.
"Sorry for interrupting, but I'm pretty sure Lucy here--"
"ELUSIVE!"
"Oh, right, sorry! I'm pretty sure Elusive here said something about finding all the mares and taking them somewhere!"
"Oh, yes! The Doctress sent us to find you all! She and your 'Doctor' are waiting for us to bring you all back! They're not too far away from here!"
"Oh, right!" said Rarity. "First things first!"
"Can you give us a ride, fellow crocodile? The mud out there still fresh and I'm very certain that miss Rarity would hate as much as me to step on it!"
"You are indeed correct!"
"Of curse can!" Vector grabbed both unicorns and placed them on his shoulders then left, being followed by Charmy and Espio.
"You're coming too, Espio?" Charmy Bee asked.
"Yes! I said I'd keep on eye on her and I intend to do so!"
Rarity winked at Espio, who looked away, hiding his blush. Charmy giggled.
"Stupid pretty pony girl!" the chameleon whispered under his breath.

"Soooooooooniiiiiiiiiiiiiiiiiic~!" Amy called. "Where are yoooooooou~? How could he forget our date? Oh, that's right, I forgot to tell him! Silly me!" she took a deep breath. "SOOOOOOOOOOOONIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIC!!!"
Suddenly she was tackled to the ground by a pink blur. She didn't identified who or what it was. She opened her eyes after a few moments, meeting a pair of big blue eyeballs.
"Hi! Are you the me from another dimension?" the pink pony with blue eyes and puffy mane and tail asked her.
"Hey, let me go!"
"Is that as 'yes' or a 'no'? Well, I'll take it as a 'maybe'! Anyway, my name is Bubble Berry! My friend call me Bubble, or Berry, or Bubbles, or Random! I don't know why they call me the last one, since it has nothing to do with my name! Actually, 'Bubble Berry' isn't my real name! It is Bubblesweiner DaVinci Berry! But I don't like big names, so I prefer Bubble Berry!"
"Gosh, you love to talk, don't you?" Amy said, pushing him aside and getting up. "Have you seen Sonic somewhere?"
"Who?"
"Y'know, Sonic! The blue fast guy!"
"You mean Rainbow Blitz?"
"No, I mean Sonic! Blue, fast, spiky hair, kinda cocky, but also kinda cute!"
"I still think you mean Rainbow Blitz!"
"Do you like cupcakes?" a distant voice asked.
"No!" another distant voice answered.
Amy and Berry looked around and found the source of the voices: a black hedgehog walking and a pink mare bouncing and following him.
"And what about cider?"
"No!"
"Have you ever heard about chimicheery?"
"No!"
"Cherrychanga?"
"No!"
"What about chimicherrychanga?"
"No, no, and whatever else you ask me the answer will be--"
"Shadow!" Amy called.
"Amy!"
"'Amy'? What a weird answer for a 'yes' or 'no' question!"
"Hi!" said Bubble Berry, bouncing toward Pinkie Pie. "I think you are the me from another dimension!"
"You from another dimension? Cool! Still not as cool as Rainbow Dash..."
"Or as cool as Rainbow Blitz..."
"But still..."
"Cool!" they said at the same time, then started giggling.
"You hae something to do with this, Amy?" Shadow asked.
"What? No! I was looking for Sonic when this... Pink thing... Attacked me! By the way, have you seen Sonic?"
"No, I haven't seen the faker all day! And I couldn't be happier!"
"A-HA!" Pinkie shouted, pointing her hoof at him. "So you are happy!"
Shadow sighed.
"It's a manner of speaking!"
"Oh! I have an idea!" Berry said. "Why don't we all go to the Doctress' time machine and have a huuuuuge party?"
Shadow's ears perked up.
"Did he said 'time machine'?" he thought.
"Sounds nice!" said Pinkie. "Let's go!"
Both pink ponies bounced away, Shadow and Amy following them.
"Why are you coming along?" he asked.
"They may have a clue of where Sonic is! What about you?"
"I heard the male say something about a time machine! I want to see this with my own eyes! If it's true, I can..." he stopped talking but kept walking.

"There you are!" said Dusk, after finally meeting the lavender mare, who was trotting alongside a two-tailed fox. "I've been looking for you!"
"Who... Who are you? And why do you look so much like me?"
"Pardon my rudeness, madam!" he bowed. "My name is Dusk Shine!"
"What a polite gentlecolt!" she said, giggling.
"You're Twilight Sparkle, I presume!"
"Presumed correctly! How do you know my name?"
"The Doctor told me!"
She rolled her eyes, smiling.
"Should have guessed!"
"Please, come with me! They are waiting for us!"
"'They'?"
"The Doctor and The Doctress!"
"The... 'Doctress'?"
"You make a lot of questions, eh? Now I'm sure you're who you are!"
"What do you mean?"
"According to The Doctor and The Doctress, you and me are the same pony, but from different time lines!"
"What?!"
"Come with me and all of your questions will be answered! Well, most of them! For instance, if you ask 'what is beauty?' nopony would be able to answer, because that would fall within the purview of your conundrums of philosophy!"
"Ok, I'll give you the benefit of the dobt because ou not only look like me, but also talk like me!" Dusk nodded and started trotting, being followed by Twilight. "Let's go, Tails!"
"Right!" he said, following Twilight and Dusk.

"Thanks for the ride, partned!" Apllejack thanked.
"It was nothing!" Knuckles said. "Still, I don't know how did you got up there without help!"
"She probably fell during a flight!" said a female voice coming from behind them. Both turned around, spotting a female echidna.
"Shade!" said Knuckles.
"Am I right?" Shade asked.
"Very right, sugarcube!"
"Who's your cute little friend, Knuckles?"
"Ah'm Applejack!"
"Hello, Applejack! Care to explain how you got up there?"
"Ah don't know how to explain! Twahligh' and The Doctor are the ones with the fancy talkin'! If ya help me find 'em they'll explain everythin'!"
"What does that 'Twahligh'' looks like?"
"Kinda look like me, but--"
"Found her!" Knuckles interrupted. Both girls followed his gaze, meeting a colt that looked exactly like Applejack.
"No, that's not Twahligh'! That's... That's... Who the hay are ya, sugarcube?"
"Ya must be Applejack!" he said. "That's mah name too, but ya can call me 'Jack'!"
"Ya have the same name as me, ya look like me, ya talk like me... Are ya...?"
"Ah'm ya! Well, ya from a diff'rent universe, but still ya!"
"What in tarnation? That's impossible!"
"Ya travel through space and time inside a blue box! Are ya sure ya want to call this lil' meetin' 'impossible'?"
"Well... Ah suppose yer right! What are ya doin' here?"
"Lookin' for ya and yer friends! Yer Doctor is worried sick 'bout his companions!"
"Then what the hay are we waitin' for? Take me to that mad pony!"
Both ponies galloped away, leaving behind the couple of echidnas.
"We follow them?" asked Shade.
"I don't know..."
"C'mon, don't be shy!"
Shade grabbed his wrist and ran to the same direction as the farmer ponies, dragging Knuckles along.
"Hey, hey, wait! What if someone try to steal the Master Emerald while i'm gone?"
Once they were far enough, Rouge got out of her hiding sot behind a big boulder.
"Now you all got me curious!"
She flapped her wings and took off, following them from above.

Author's Notes:

I want to apologize about my grammar. English is not my native language, so I may have some tiny-winy difficulties here and there. Hope you don't really mind that. Again, I apologize if you're not pleased with my writing.
(By the way, I don't know the plural form of TARDIS, so I just came up with "TARDISs"!)