[haha! that episode had some great lines]
That quick, birdlike tilt of her head returned. "Did he? I suppose it's possible. But the Time Lords discovered that if you pull an eleventh dimension matrix into a frame too small to contain it, it would punch a hole in the universe, and trying to destroy one outright would cause a singularity to erase the attempt and attemptor from history, resulting in a type four paradox that the existing matrix would settle with absolute prejudice. But humans are so much.... bigger on the inside. Still, I won't suppose it shall last. I'll never be designed to exist in a flesh body."