My Backround Pony: Sidelines are Magic Ch 2

The Doctor had finished regenerating and began heading to the door. "Drat" he had remembered that the TARDIS was activated. At this point all he knew was he had to get back, though it would be difficult not knowing when or where he was. He suddenly realised he was...on all 4s? He noticed his hands and feet were replaced with hooves. "What am I?" he paused for a moment or two then shook his head, "No time" He took a step outside and looked at his surroundings, hoping for a clue of his location. The area seemed quite...cartoony. He also noticed he was in a forest, but other than that, nothing seemed familiar.In hopes of finding civilisation, he began walking though after a few steps saw something crash in front of him. Once the dust cleared, he saw a grey winged horse with a blonde mane and tail, crossed yellow eyes, and bubble marks on her rear. It, or rather she, stood up shaking her head to focus.
"Oh, sorry about that. My name's Derpy"
"Nice to uh...meet you, Derpy. I'm the Doctor. And don't worry about it"