Doctor Whooves Adventures/WMG

Pinkie Pie is actually River Song

If only because everyone seems to think so, however it actually does make sense if you think about it...

• She knew about the Weeping Pegasi and didn't read the letter the Doctor left for Twilight and Spike warning them about it, implying foreknowledge or experience with them. (Number 12 Part 1)
• She knew about the mechanics of how the TARDIS was bigger on the inside. (Number 12 part 1)
• She used weapons (a Battleax to be exact) and destroyed a Weeping Pegasus. (Number 12 part 2)
• She can get in the TARDIS whenever she wants, to the point where she throws frequent parties. (Q&A 1-3)
  • In fact the only thing that goes against this theory is the fact that she didn't know how to drive the TARDIS as well as River can/better than the Doctor (Although she might be able to pilot it better simply because she is a pony and knows how to use her hooves but...) But he allows her to drive the TARDIS with him, showing she at least knows something, he doesn't let just anyone drive his TARDIS.
    • Also in the Chords of Chaos post-interview, someone asked if Pinkie Pie was River Song and even if they were joking when they said it was canon (perhaps...) the possibility seems to exist.

The show takes place in its own universe, not the main MLP universe

• When the Doctor tells Twilight about Time Travel, she says that it's impossible. But there was a whole MLP episode about Twilight traveling through time, so she knows that it is possible. But that Twilight is not the same as this Twilight. They're parallel Twilights in parallel universes.