“But what is she?” asked one of the scientists to the Doctor in an aside.
The Time Lord looked up from the sample he was examining through a microscope at the woman in a white coat addressing him, glancing at the shelf on the other side of the room where his four-inch-tall companion stood scrutinizing racks of test tubes. They knew one of them was wrong, and she volunteered to find out which out of the 75 tubes it was since her eyes wouldn’t tire as easily as any of the human scientists’ would looking at the miniscule labels.
Turning back to the scientist, he gave a sniff and replied, “I rather think that’s her business to share, not mine. Although,” he added as he focused back on the microscope, “to be fair, if you asked she probably wouldn’t tell you.”
“And why’s that?” the scientist hissed, sounding affronted.
“Cause you’re human!” exclaimed the Doctor, not bothering to look up from the microscope this time. “Would you trust somebody who looks as big as you do to her right off?”
Her gaze wandered over to the impossibly tiny woman still searching tirelessly through the test tubes, and she heaved a resigned sigh. She supposed she wouldn’t. Rather than admit that, however, she pressed on. “But she trusts you, and you’re taller than I am!”
“Well, you’ve got me there.” The Doctor straightened to his full height–a full head taller than the female scientist–adjusting his crisp royal blue suit. “Little over sixteen times her height, I’m surely terrifying. In’t that right, Zepheera?”
His tiny companion’s head snapped up at the mention of her name, only to find the Doctor crossing the room right toward the shelf she was standing on. After all this time, it still blew her mind how fast someone so large could move.
“I’m just as scary as any mean ol’ human, eh?” he smirked, pulling a teasingly startling ‘rawr’ face close to the eye-level shelf as he passed the borrower and moved on to fetch whatever he was after.
Zepheera flinched at the sudden lack of space, but shot an exasperated look through the back of her friend’s head. She went about her business, muttering about what a giant ten-year-old her Time Lord was as she worked.
Borrowed Time and Space 