Letters to Sarah Jane
Hello Sarah,
It's been some time since I dropped you in South Croydon. I hope you're well and that K-9 M III is keeping you safe. I'll warn you though, that dog is a ruthless chess player.
I'm sure you're wondering what I've been doing and who's been traveling with me. Writing down all of my adventures would take too long, but I'll tell you about my companions.
The first young woman that I met was named Leela. She was a member of the Sevateem tribe from a faraway planet that humans colonize in your future. She was a bit brash and always carried a dagger with her, but all in all she was a sweet girl and it was with her that I met Professor Marius, the man who created K-9. The little dog took a liking to us and Marius asked if we'd take his creation with us seeing as he was heading back to Earth were his real dog was. After a bit of fun Leela to left me. We were on Gallifrey, I'm sorry that you never got to see my home, she fell in love with the guard that helped us and K-9 stayed with her.
Luckily I had made a K-9 M II. Soon after that I was given the mission of assembling the Key to Time by the White Guardian. He sent a woman by the name of Romanadvoratrelundar, I called her Romana for short. She was a Time Lady, which marked the first time since Susan left that I had a member of my own race aboard the TARDIS with me. After that was done she regenerated, not because she died like I did, but because she simply chose to change her look. Her personality also changed. She went from being like the others of our race to being cheery, sweet, and quite tolerable. K-9 seemed to like her either way, but what does he know?
While Romana was with me we ended up in E-space. There we met a lad named Adric. He's very intelligent and earned a badge for mathematical excellence from his people on Alzarius. He still has a lot to learn, but there's nothing that I can't teach him. He's the only one with me right now. Romana left to help those in E-space and took K-9 with her. By that time I had already sent you M III and I don't feel like pulling M IV out of storage.
Now, you're most likely want to know why I'm writing you. Frankly, I've no idea. I'm sitting in the library while Adric sleeps. Earlier he was asking about who else had traveled with me. Of course I told him all about my best friend. The journalist that stowed away on my blue box before getting into her first bit of trouble. The one that quickly came to be my companion and friend. The woman that saw me through my most recent regeneration. You cared for and worried about me more than most.
I miss you Sarah, and I regret obeying the rules and leaving you behind. Not taking you with me will always be one of my biggest mistakes and I apologize if I made you feel as though I no longer wished for you to travel with me. If I could change that one moment I would, but as you know I can't.
Your Best Friend the Doctor