Well, hello! I'm The Doctor.
Quite fascinating all this, really. Isn't it. Travel through Time and Space. But, not only that.
Dimensions! I haven't been able to travel through dimensions whenever I wanted for
years. Not without creating a big messy tear anyway.
But, yes. Anyway. Hello. Like I said, I'm The Doctor. Here to help. But, mostly here to stop you from making too much of a mess. It's a fine line. And, paradoxes are never fun for anyone.