Sunset Shimmer the Doctor's Companion.

The group got into the TARDIS, then the Doctor's 'timey wimey' device suddenly beeped.

"Alright guys, I got to go to Control Room Beta to check a message that's only shown on the console." the Doctor said as he headed off to check the message.

"OK, meanwhile, I'll show the place to Shimmy. Well, Melody now, I guess." Sunset said as she turned to Melody.

"Thanks, I know my way though. Where do you want to go?" Melody replied.

"Wow, Mrs 'Music', you're a box of surprises," Flash said with a smirk.

"It's Melody, dear..." Melody replied with a bit of annoyance. "Seriously Sunset what did you seen on this moron?"

Sunset Shimmer decided to intervene before Flash and Melody got into an argument. She said, "Melody, first, he makes me laugh also, I wanted to show Equestria to Flash . Can we go now?"

Melody operated some levers before placing Sunset's hands into a jar full of goo with wires sticking out of it. She then explained, "It's the TARDIS telepathic controls. Concentrate on Equestria."

Sunset began recalling her fillyhood in Canterlot, the first time she managed to levitate something without turning it into a plant or goop. The time her conscience took a dark turn, how she tried to seize Canterlot at first, then all of Equestria. She tried to remember happier thoughts, thinking about her former friends in Canterlot, Minuette, Lyra and Moondancer.

The TARDIS then started to make it's whooshing sound. After it passed through the six dimensions in the EQG universe, it drifted down to the multiverse silver lining, fading out of existence, leaving the dimensions. Then, it teleported to Equestria, at the same moment the Doctor came back to the main control room.

"What's this ruckus?" the Doctor asked. "River, you flew it again?! You still remember how to?"

"Well, you did teach me. Remember?" Melody replied casually. "Oh, also, my mom wanted to name me Melody."

Sunset then removed her hands from the goo jar and waved at the Doctor, "Hi, Doc! I was the navigator."

"I see... Inside job, I guess. So where are we?" the Doctor asked a bit worriedly.

Melody cleared her throat and answered, "Dimension C137, system Omega Centauri, planet Equus, Equestria, city..." Melody then paused and checked the name on the telepathic terminal's console. "Canterlot!"

"I see. Wait a minute, where is it? The thing, you know, the box with lights, that  beeps." the Doctor asked as his eyes gazed around the room, searching for the box.

"Everything here is like that, Doc." Sunset said as she waved her hand around, pointing to all of the similar equipment.

Melody checked under the TARDIS console and whipped out something similar to the Doctor's description. "Here it is!"

"You won this round, Melody." the Doctor said as he took the gadget from Melody.

Melody replied with a throaty, "You won me a long time ago."

"Hey, sass later. Now Doc, explain that thing to us." Sunset said as she separated her copy and the Doctor.

"Hm, yes look at this screen," the Doctor pointed to a screen that just bleeped to life. It showed the TARDIS's surroundings, old fashioned buildings, and a lot of multicoloured Pony forms.

"As you can see, they don't look like us. This device is a portable DNA converter." the Doctor explained as he pointed to the gadget in his hand. "It modifies your body to fit the others around you, but it also gives you the looks that you had since you wrote born here. So we would basically become ponies, like everyone else here. Clothes?"

"Optional." Sunset replied. The Doctor said "Rats!" while he closed the wardrobe and activated his device, and everyone faded out before ponies took their places. Sunset mused, "So here we go again."

Flash then looked at Sunset and gasped, "Wow, you're a unicorn!"

Sunset then replied with a knowing look, "Obviously. And you're a Pegasus!"

Then, Sunset looked at the Doctor and said, "And you look like... Time Turner? The weird science pony from Ponyville?"

The doctor was puzzled for a second before replying, "We have alternates here, so my pony form would look like my alternate. Yes, it happens. Sunset, since you came from here, you can rest. Unlike you, Flash. Now there are two of you..."

Sunset comforted Flash, who began to panic. "It's fine. This can be fixed with make up and accessories."

"I-if you say so..." Flash stuttered nervously.

A few minutes later, Sunset was busy with a comb, brushing Flash's mane. When she was done, Flash's scalp line was dead centre on his head, and he also wore a pair of round glasses, which had false lenses.

"How do I look?" Flash asked as Sunset adjusted his glasses so they lay right in the brim of his snout.

Everyone tried to hide a laugh while Melody bluntly admitted, "Sorry to say this, Flash, but you look like a nerd." Melody set off the laughter of the whole group, and eventually Flash laughed too.

"Well, gang. I don't want to leave all the fun, but I want to see how Canterlot is doing." Sunset said as she and the Doctor pranced to the TARDIS door. The Doctor tried to open the door with his hooves, but to no avail. The Doctor gave Sunset a pleading look. Sunset understood and concentrated, her horn surrounded by a golden aura. She then materialized an arm that opened the door. Sunset then said, "There you go, Doc."

"Thanks, Sunset. That was pretty... Handy!" the Doctor said as he laughed at his own joke.

The group then pranced in an alley, as the street next to them was busy with a market. Turning to the the rest of the group, she informed, "It's Tuesday, the same day it was where we started, in the human world!"

"That's because both of these universes are in sync." the Doctor said as he tried to adjust to walking on four hooves.

"Hey, anyone mind me lagging for a bit? I want to find out some things about this place's culture." Flash asked as he slowed down.

"Suit yourself, Flash. But remember, here it's anypony." Sunset replied as Flash started to walk to some stalls.

Flash was walking between all the stalls, stopping every so often to look at the items before walking to another one. He looked almost like a natural pony, besides for the fact that he tripped every now and then, due to his lack of hoof usage. He then stopped at a stall and asked, "Hey, you! How many for that shirt?"

A ruckus began forming there. A gruff looking pony with a set of concrete shoes for a cutie mark was now arguing with Flash, who cowered behind the stall table. He then nervously said, "I only asked you how much!"

"And I told you that it's four bits, then you hoofed me these worthless scraps of paper!" the stall's owner raged.

Flash then spat out, "That's ten dollars, that's more than enough for a shirt!"

"Your toy money isn't worth anything here. Oh, there's the police when you need them!" the stall owner smirked before calling to the police. "Hey, Agent! Come here, I caught a burglar for you."

The Agent, a juvenile mare pranced to them and said, "Agents Babs Cooper from the CCD. Sir, I understand you have to explain yourself. What's going on?"

“He refused my money! He said it was worthless!” Flash then hoofed over the dollars to Babs.

Sunset, who was about to check on Flash intervened, "Babs Cooper? As in Barbara Cooper?"

"Uh, yes? Do I know you?" Babs asked with a bit of confusion as she examined Sunset.

"I think I might... Or maybe not." Sunset answered strategically.

"Good save." the Doctor whispered to Sunset.

Sunset flicked her ear before producing four golden coins and hoofing them over to Flash. "Here, for your four bit shirt of 'blame my sister'?"

"I like it dear." replied Flash.

"Hey, what's your name? I have this crazy idea of knowing you." Babs asked curiously.

Sunset replied, “I’m Sunset Shimmer, I was formerly Princess Celestia's protégé."

"It doesn't ring a bell. I'll remember your name, but I feel like I know you from somewhere else." Babs mused.

"It happens to the best of us." Said Sunset."Well, see you later, Agent Babs!" Sunset said as she waved a hoof in farewell

"You can call me Barbara." Babs, or rather Barbara said with a smile.

"Will do, Barbara." Sunset said as she turned to her boyfriend. "Do you think she's the Barbara Cooper from Canterlot high? Besides, do you know what 'blame my sister' means?"

"Uh, that someone's sister deserves to be blamed?" Flash guessed as he scratched his head in confusion.

"Probably. But Twilight once told me about this thing Luna once had with shirts," Sunset explained.

Not gone yet Barbara's ear flicked commented, "Twilight? as in Princess Twilight Sparkle! I know she's Celestia's pupil."

"Uh, yes. She sorta is..."  Sunset commented. Barbara's eyes were then focused like two lasers on Sunset's eyes. "Sorta? Didn't you tell me that you were Celestia's pupil too?"

Tired by now, Sunset said to nopony in particular, "Please, not this again..." Lighting her horn, Sunset lowered it just above Barbara's mane. A spark connected from Sunset's horn to Barbara's scalp as Sunset said, "There you go."

Barbara fell on the floor drowsily. Her mind was in a whole different timeline that was just thrown at her. She called out, "S... S... Sunset Shimmer! We saw you last week! There was Lt. Brass too, but... He can't be..."

"Wait until it dawns on her," Sunset said to everypony.

"Wait, when did I have these weird dragon claws? And this strange metal cart propelled by... Magic?" Barbara wondered out loud.

Sunset answered, "Babs, you've forgot the essential. Do you know how we became friends? Remember the Kaiju attack?"

Y-yes, of course I do! You were amazing there, how you kicked his butt! Clearly you weren't from this world. You were like a superhero, uh supermare... Or..."

"Jeez, cut it out, Babs. I'm just me." Sunset said as her cheeks flushed red.

"Superhero shame." Somepony in the crowd gathered around the group grumbled.

The gang plus Barbara seen that they began to gather unwanted attention. Sunset quickly wrapped her magic around the group and teleported them to a safer location.

Pony Joe's Donuts ET Co.

A sudden pressure change indicated the group's arrival. Babs immediately went to vomit behind a potted plant. Her pony self didn't allow her to do that, but her human memories fooled her. "Hey, S-Sunset? Do you ever get used to having a second set of memories?"

"Not really. I should have four or five sets from different timelines by now," Sunset answered after a moment of thinking.

The noise grabbed the attention of a squad of Princess Luna's Night Guards. They left their pastries when they saw Flash in his new 'Blame my Sister' shirt. "Hey, you! You must be Smarty Flanks, Princess Luna's mate. She's now at the little fillies' room."

Flash just stared in surprise and said what anyone would've in that situation, "Huh?"

Majestically, Luna made her entrance. She approached Flash and laughed at his shirt, "I like stallions with a sense of humour!"

Flash, now in complete awe, tried to wrap his head around the fact that a vice principal like Luna was now a princess. He then grabbed a doughnut and began to chew on it.

Luna, in mock horror said, "You ate the last gooseberry doughnut! Gooseberry doughnuts are my favourites!" with that, Luna quickly jumped onto Flash, French kissing him to capture every last bit of the doughnut.

Sunset had to use every last bit of her composure to not attack the princess while she was busy kissing Flash.

Then, Celestia and Babs came out of the little fillies room, where they had done their business.

"So unicorns have to teleport with great care,  previously alarming everyone. You understand me, Officer?" Celestia asked Babs.

"Y-yes, Princess..." Babs replied.

Hearing that, Luna spun her head towards her sister and called out, "Hey, Tia! We're here!"

Sunset realized the results of her sketchy past and sat low, pretending to be unsuspicious. She then mumbled to herself, "Fat chance, my pretty."

"So where's your champion, Luna?" Celestia asked.

"Uh, it was here, sister," Luna replied.

"I got this..." Celestia started. Seeing Sunset deep in her chair, she said, "Sunset Shimmer! Officer Barbara told me about you while we were in the lavatory, how you single hoofedly vanquished a Kaiju and undid his last evil doings! Sunset Shimmer of Equestria, I hereby decree that your banishment is lifted!"

Meekly, Sunset Shimmer crawled out from her hideout, eyes glued to the floor, her ears low.

“Sunset why you don’t use your Equestrian form? What is this pantomime?” Celestia asked with a caring smile.

“I am a unicorn, I was a unicorn, and it is how it should be," Sunset replied, her eyes not once moving from the floor.

“In the lavatory Officer Barbara asked me to rid her mind of her new memories. I know how your fight went, and I also took some of your memories that you accidentally put on her. I know that last time you were in Equestria, you weren't a unicorn." Celestia lifted an eyebrow while lifting Sunset's head to look into her eyes.

"I don't know... Look, Celestia. We didn't come here through the mirror, we used-" Sunset started explaining before being cut off by Celestia.

“A TARDIS? Yes I already know, Sunset," came Celetia's reply.

"It's harder, the Doctor supplied our human aspect with some doo-hickey that basically adjusted our shape," Sunset explained.

"It's not that much harder. This device works over..." the Doctor said as he stood up to point at something that said 'Timelord Technology'. "So, this Timelord Technology is by no means more powerful than magic. So, once suppressed this technology field, your true Equestrian forms would be here if you were born here."

Sunset then signalled to the Doctor with her eyebrows in the universal signal to 'come on!'. The Doctor saw this and got his device from his saddle bag, and as an earth pony, he had to mouth grab his sonic and use it as a stick to turn the device off.

Then, all four of them began to glow, their bones creaking in their magical transformation. Then, four became five stunned ponies!

Sunset then delivered her trademark, "Now this is unexpected..."

All of them stared at the two ponies that used to be Shimmy but now, Shimmy and Melody.

Melody appeared as a middle aged unicorn, her mane curled wildly. Her first words in this form were, "Doc, or rather, hubbie. "River Song, archaeologist extraordinaire is back!"

The other big difference was Sunset Shimmer. The Impossible Mare she definitely was. She stood as tall as Luna, who now looked amazed at Sunset's wings.

Celestia teased Sunset, “It looks like Sunset Shimmer, princess of necessary evil is back too… Nah, you can’t go around with that title. I can sense the lack of an evil bone in you."

"Well, if you ask like that for me to have a title, I learnt something in Canterlot High 's history class about a god Egyptians had. It was something alike Seth, god sovereign of the two kingdoms, crops, and necessary violence." Sunset said with a smirk.

Celestia blinked quickly in surprise at that. “Well I suppose it can be Sunset Shimmer, princess of necessary violence…”

"And Princess? Why did your sister kiss my special somepony?..." Sunset asked.

"I diamond-dog dared her to while we were in the lavatory, to kiss the first stallion in sight. Between us, she's quite stuck up since her return. It's quite cunning, isn't it?" Celestia answered, a small Evil? smile on her face.

Sunset now blinked, trying to completely understand the ordeal, while Melody was cackling madly, "Ohhh! That's rich! You princesses are both like a truck full of clowns!"

"What's a truck? And a clown?" Luna asked, confused.

"A caboose full of jesters?" Shimmy corrected.

Then, the Doctor began to feel light headed. Melody was now at his side, eyes full of sincere remorse. He said, "It must've been something I ate, don't worry, I'm fine now."

"Sorry, Doctor... I just had to be sure..." River murmured nervously.

The Doctor then got on his knees over to cobble street. He closed his eyes tightly, and when he reopened them in par to his mouth, a bright yellow light was released, accompanied with a throaty scream.

The group plus the princesses took a step back. Celestia asked angrily, "Melody, what did you do?!"

Melody was on the verge of tears. "I kissed him... I needed to be sure! HE SAVED MY DARN LIFE, AND I NEEDED MORE EVIDENCE TO BELIEVE HE WAS HE!!!"

Celestia took a step back at Melody's outburst. "You hurt him by kissing him?"

Melody replied throatily, "Yes, my lipstick, is venomous!"

Meanwhile, the light radiating off of the Doctor faded away. Now instead of the young Doctor, he looked elderly. His mane was silvery grey, but he was definitely very alive. He looked at himself in a puddle's reflection. "I need a mirror, two ears, good, and two eyebrows. I don't like these brows! They without a doubt are attack brows!"

Twolight, having no magic, asked someone else to clean her glasses. "What's this? Permutation? Transmogrification?"

"Plain old regeneration," River answered before launching herself at the Doctor, who stepped back.

"No more kisses of the dead, Black Widow!" the Doctor chuckled. At River's sad look, he smiled and said, "How about a hug for starters?"