Ok, I'm insane. I wrote a fic about Martha before her screen debut. But never mind. I've word couted the actual thing and it is 200 words, the rest is just this introduction. Enjoy!
Her mother had always told her to trust her instincts. And that's exactly what Martha was good at. So it didn't take her long to figure out.
He'd never spoken about who had gone before her, but instinct told her that there had been more. So she'd decided to investigate.
She'd peered around the various rooms of the TARDIS, and she found it. A closed off room. It couldn't have belonged to someone older than about 20. A girl probably, judging from the pink duvet. She wondered what had happened to whoever had lived there. Maybe she'd died.
Because behind the Doctor's happy-go-lucky, friendly (and geeky) exterior, she knew that he was holding something back. Always holding something back. She wondered if he had been in love. Maybe he had been. She'd asked to see Canary Wharf as it was in the far future, seeing as how it was London's tallest building in 2007, and for a moment the mask had dropped and she'd seen the real him.
How had he lost her there? But the mask was quickly replaced, so she left it at that.
But Martha knew. That girl had been special.
She wondered how she had died.