1. I am the Doctor. The original, you might say.
2. The 'little fellow' is right here, thank you very much!
3. Smith, then. Doctor John Smith.
4. Well, hello there! I'm the Doctor, how do you do?
5. I am known as the Doctor.
6. A student of science, nothing more.
7. That was my nickname at the Academy. Theta Sigma.
8. I! Am! The Doctor!
9. I'm the Doctor, she's my plus one.
10. I'm the Doctor, and if you want to take it to a higher authority, there isn't one.