The Doctor was running frantically towards the last place he saw him. He was his only chance to get back to his TARDIS. The Doctor was looking for a blue pony, he didn't quite remember what race, though that wouldn't matter. In his rush he hadn't realized some of his company was missing. In all the hullabaloo of the TARDIS gone missing and ponies going home in crowds from the wedding, The Doctor and Derpy had lost Amethyst and Dinky. The Doctor had gotten three fourths of where he was going before Derpy landed on him from above with a large thud.
"Doctor! Doctor! I can't find them! I lost them! What am I going to do?" Derpy shouted frantically.
"Who? What?"
"My daughters! Doctor we have to find them!" Derpy shouted.
"We will. Don't worry. Once we get the TARDIS back we'll all be together again." Reassured the Doctor. The Doctor got up calmly and brushed himself off. "Well, we're here." And there before them stood the TARDIS, though something seemed a little different, to Derpy at least.
The Doctor pushed on the door only to find it locked, "Bloody, insecure devil. Leaving the TARDIS locked. Nopony is going to look inside." the Doctor muttered getting out his TARDIS key.
He unlocked the TARDIS door and entered surprisingly cautiously and flipped on the light switch. The TARDIS was VERY DIFFERENT! It was very white with circles on the walls, and the engine was not even a quarter of its normal size. Over half of the gadgets were missing and there was only one door and one monitor in sight. "Um Doctor, this isn't YOUR TARDIS, is it?"
"Well yes and no." said the Doctor strolling around quietly, with a glimmer of nostalgia in his eyes. "Ah the benches, the little wooden benches." he said with a giddy giggle. "Priceless!"
"Ey you!" boomed a voice from behind them. "What do you think you're doing?"
"Oh you...you're such a doll." Replied the Doctor.
"You watch your mouth!" the figure stepped into the light revealing a blue earth pony with a white collar, red bow tie, dark yellow mane and tail, a red bow tie, white hat with red brim, and a stalk of asparagus pinned onto his lapel.
"I've tried that, not really much fun, but oi! What are you doing!" The blue earth pony had tackled the Doctor and was wrestling him on the floor. "No physical contact! NO PHYSICAL CONTACT!"
"Says who?"
"First Law of Time, Gallopfreyan codes!"
The blue pony stood "Oh no...you're..."
"Yes let it out."
"You're a fan!"
"Yea- wait no I'm not a fan I'm you!" Boomed the Doctor making Derpy giggle.
"Preposterous!"
"Hello, Doctor pay attention to this mane style, cause one day you'll be brushing it!"
The blue pony stood there staring blankly at the Doctor. "Oh no."
"Oh yes."
"So you're..."
"yes."
"And I just caused a paradox?"
"Yup." Just then loud sirens started booming and lights flashed red. "That would be my cue." The Doctor stepped up to the controls and took over and after a long series of complicated actions the buzzing stopped.
"How did you? I can't even...Nobody can."
"There you are right."
"So you only knew how to do it, because you remember being me watching you do it?"
"Precisely! Wibbly-Wobbly, Timey-Wimey!"
"What?"
"It's nothing really, but um I need help finding my TARDIS."
"No problem."
"So he's you? Okay." Derpy butted in.
"Yes. Number Five."
"And you would be?" asked the Fifth.
"Eleven."
"Okay then, getting a little old are we?"
"Pft don't remind me." Replied the Doctor.
"And is she..." Said the Fifth motioning to Derpy with his head, "River?" he muttered under his breath.
"No no nooooooo!" replied the Doctor blushing.
"Okay then, radar says there's another TARDIS right there." said the Fifth.
"Thank you Doctor. Let's go Derpy! Allon-y!"
And then the Doctor and Derpy were off.