Hello there. You don't know me, but I bet I can guess who you are. You're a brilliant, unique girl who intrigued the Doctor in some way, and after some wild adventure that involved a lot of running, he asked you to come with him in his magic blue box that's bigger on the inside. You didn't believe much that he told you at first, but you eventually gave in and opened your eyes to his wonderful world. And I can guarantee that you trusted him almost immediately after he grabbed your hand or gave you a cheeky smile.
Don't worry, love. You aren't the first to go down that road.
But I also know that you're still new to this life, and while you're fascinated by it, it also scares you. I know this because when I hid this letter, I asked the TARDIS to reveal it to the next person that needed it.
Yes, the TARDIS is alive. She can also translate languages for you. You'll get used to it.
The Doctor has his own set of rules, some that you may know by now and have probably broken (again, you aren't the only one). This letter contains five extra rules for you to follow, written based on the experiences of someone who has been in your situation before.
5. Listen to the Doctor. I've seen people end up with very sad fates after not following his advice. But if he goes off on one of his explanations that include lots of big words and things you've never heard of, just sort of smile and nod when he takes a breath. It worked for me.
4. It's okay to be scared. Visiting new planets is fantastic, but it's always a little terrifying to think about what you might run into. Just don't let your fear keep you from having the time of your life.
3. Keep an open mind. You're going to see things that you've never seen before, so don't automatically dismiss anything as a fairytale or simply impossible. Nothing is impossible, not with the Doctor.
2. Don't let the Doctor be alone. He'll need you, even if he doesn't outright say it, because he won't. He doesn't say a lot of things that he should. Just keep him company; he'll appreciate it, I promise.
1. Don't fall in love with the Doctor. It isn't that simple, I know. He's brilliant, cheeky, and unlike any man that you've met before. But he's lived to see too many of his friends grow old, die, or leave him, and he's always afraid to get too close to someone. I can't blame you if you do, but be careful. Don't hurt yourself, or him.
I hope this letter has helped. You may not realize it, but you are very lucky. Out of all the people in the world, he stumbled upon you, and now you're having one of the most wonderful experiences that a human will ever have. Good luck, and happy traveling.
- A friend