"...They deserved it and much more" Ditzy Doo, the truly fastest flier in all of Equestria, flew into space, even though her ears had popped, she kept going.
Not breathing, her fur glowing in the starlight, the only thoughts in her head were "I curse you, I curse you... I curse all of you!" she went past the last planet, and still shot through space, her eyes focused on the point in front of her.
What she didn't see was an object heading for her, the subtle "whooshing" noise impossible in the airless environment. Then she saw it, colliding with a wood splintering crash, and entered a place full of odd machines. "What?"
"Where am I?"
"What?"
“I said 'where am I?' are you hard of hearin- huh, I can breathe. Interesting... and upon further inspection, this would appear to have a spatial indifference module as well as a stuck chameleon shield. Oh, and a perception filter, meh, a pretty low tech one at least. Ah well, back to shooting across space. Sorry about the damage to your space and time machine" she rambles
"What?!" the pony asks, looking at the strange Pegasus in front of him. "How did you know all that?! And how are you here?!"
Sighing, she looks at the stallion "It's obvious, especially with the whole 'smaller on the outside' thing. Anyways, I need to get back to cursing stars and other celestial bodies... fare thee well good sir." she replies, and jumps out the hole.
"That was weird, oh well; he seemed nice and didn't laugh at my eyes... I don't curse him" she says, returning to her linear path.
"Wait! I never got your name! I'm The Doctor by the way!" the pony yells, his box keeping pace.
"Ditzy doo! Now leave me to die Doctor!" she screams, when a sharp prick hits her neck, she slumps into sleep.
"And Sarah Jane Smith said a blow dart was a stupid purchase!" the pony says, pulling the prone pegasus towards him.
As she comes to, Ditzy notices she has a jacket on, the hood helping her eyes adjust to the low light.
“Ah! Good! You’re awake! Hello, MS. Doo! Welcome to my TARDIS! By the way, how were you holding your breath in deep space?” The Doctor askes, munching on a stick of butter.
Ignoring him, she takes in the room she had left “Obviously, I am in purgatory, because it is far too warm for tartarus. And too dark for the heavenly stable” the Pegasus mumbles into the jacket.
“Is something the matter?”
“No, I just torched the town of my enemies, after taking so much scorn for years, and I flew through space, angry at myself rather than them, and crashed into a space ship with a butter munching earth pony. I’m just peachy keen… I actually knew a pony named Peachy Keen, she hanged out with me on a dare once” Ditzy replies, her eyes looking at the pony in front of her and an odd pillar in the center of the room.
“That sounds like quite the story… care to tell it to a space alien?” the pony says, sitting down next to her. “I haven’t much to do anyways, blueberry muffin?” he asks, offering the edible piece of heaven to her
“Thanks, well; it’s like this…”
The pegasus’ words flowing out like a stream, from her first school day to crashing into the ship.
“That sound a lot like my life story… wanna hear it?” he asks, rubbing his chin
“It’s only fair, I spill my guts, so you should do the same” Ditzy says, pulling the hood down.
“…” The Doctor is speechless when he sees her face
Ditzy sighs “You’re not going to make fun of my eyes are you?”
“… Perish the thought… Ms.-“
“Just Ditzy”
“Ditzy, you look absolutely…”
Here it comes… Ditzy thinks
“Beautiful! Just plain brilliant looking! Want to see the whole of time and space with me?! It is so very lonely here in space, and…”
“Doctor, you had me at ‘beautiful’… just promise me a few things” Ditzy says softly, placing a hoof on his lips.
“…Okay… shoot.”
“One, do not make fun of my eyes, second, no freaky space monsters, third, stop this place from spinning! I can’t see straight!” she commands, pointing to her spinning eyes.
“Uh, it always spins, and second, are you hungry?” he asks, walking to what would appear to be a kitchen.
“Uh… sure why not? So I guess that you aren’t from around Equestria?” she asks, following.
“Meh, I come and go, whenever I’m no longer needed, could you pass me the butter?” he replies, putting a kettle of tea on while plugging in what looks like a 16 slice toaster filled with what looked like waffles
She turns her head to look at all of the machinery, from French presses to a spinning jenny. But her other eye notices that there is a freezer
Filled with butter, butter, and more butter
“Well! You’ve found my butter closet! Where and whenever I go, I always make sure to buy several things of butter. I like butter, most people say that butter is like edible sand; it just sits there and gets into places. I disagree, it has many uses, like when you forget to bring a banana to a party.”
“Can you stay on one topic at a time?” Ditzy asks, rolling her left eye.
“Sorry, it’s just… I’m so lonely in the vastness of time and space. No one to share it with” the stallion lowers his head.
She sighs and trots over to the oven, putting gloves on and pulling the muffins out. “Here, have a muffin” she uses a wing to pull one from the tray
He takes it but looks confused “I didn’t put any muffins in the oven… and you couldn’t have… so who did?” he bites into the muffin and gasps
“Figure out who the mysterious baker is?” she asks, biting into the muffin
“No, but this muffin is wonderful! So crispy and light and moist! I wasn’t cold but now I’m toasty!” he exclaims, trotting back to the center room
“…Not much fazes you I’m guessing” Ditzy asks, tossing the empty wrapper in the trash
“So! Ms. Doo! Where do you want to go? The past and eat crumpets with Neighpoleon or Manehatten and buy a train ticket to Saddle Arabia?” he asks, pushing buttons and pulling levers seemingly at random
“Yes” she responds, sitting in the chair off to the side
“Okay then! Both it is!” he presses a big green button and a loud whooshing noise fills the air, lights brightening and dimming as the doctor laughs
I like it! Could use a bit more expressions in emotions and explanations because like, mystery baker?? And how did Ditzy breathe in Space?
Maybe some better detail in their surroundings to paint a better picture of the TARDIS or the dead of Space.
Also I like that your making Ditzy smart and dull and The Doctor hyper and desperate for company but there is almost no possible way for Ditzy to have known the TARDIS was a space and Time machine, a space shuttle maybe but she's been given no evidence that it can travel in Time just yet. And her dull personality makes sense after whats she's been through but Ditzy's character here is so dull I could say she should go live with Pinkie Pie's parents 'cause sheesh a suggestion; make Ditzy bounce back while journeying with The Doctor. She even said she didn't curse him because he didn't mock her about her eyes so you can work off that.
The Doctor's personality is great in this story he's smiley, bouncy and hyper yet he's just lacking that knowledge that we all fell in love with, his ramblings and tendency to get distracted by the small things that catch his eye, Ditzy's ability to breathe in space as an example; he noticed it meaning you've made it clear that its abnormal for ponies to do that but he wouldn't just let her change the subject no matter how annoyed she got 'cause he's an annoying pony.
Again I really like the concept of this spin-off and its only lacking the little things and I encourage you to keep writing!
But you also might want to ask the original writers permission, unless you've done so already I'm not sure how it works sorry
4713776 all will be revealed in a doctor who(ooves) fashion,
ditzy will become more animated as she loses herself in the adventure, and as for how she knew it was a time machine, she had read a number of books after her accident and guessed. she is also melancholy because of her conscience