On the day before her 800th year of her lonely reign without her younger sister, Celestia takes the day before to mourn over her sister ever since she was banished to the moon. But on this particular day of grief, she gets a visit from the Doctor, along with somepony whom she hasn't seen in a very, very long time, her sister Luna.

Any kind of constructive criticism is welcomed. (The key word here is "constructive".)

A special thank you to SecretBrony01 for proofreading this story.

The Doctor has lived a long life, and he's seen a few things.
He walked away from the Last Great Time War. He marked the passing of the timelords. He saw the birth of the universe, and he watched as time ran out, moment by moment, until nothing remained. No time, no space, just him. He has watched universes freeze and creations burn, he has seen things you wouldn't believe; he has lost things you will never understand. And he knows things: secrets that must never be told, knowledge that must never be spoken, knowledge that would make parasite gods blaze.
But in 909 years of time and space, he has NEVER seen ANYTHING quite like where he just found himself.

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Featured on: 7-12-14, 8-22-14, 9-8-14, 9-20-14

When the 10th Doctor regenerates, his 11th incarnation is a little different than we all know with looks. Even worse, he has landed in a new (but familiar) world. Now he has a new TARDIS and a new companion, Twilight Sparkle. From Alien Prisoners to Weeping Angels, this Doctor will succeed at it all. Equestria Girls universe, possible Doctor/Twilight. Avante!

Twilight was having a perfectly normal time waiting for the Doctor to show up, but when the TARDIS lands with a mare named the Professor in it instead of the Doctor, what can Twilight do? As the Professor and the Doctor explore their new worlds and meet some old new companions, they have one chance to get home, the winter full moon. Will all go well for the battling universes?