What my friend asked: What's Doctor Who about? What I said: It's about an alien named 'The Doctor' who travels though time in a spaceship that looks like a police telephone box, who saves people and other aliens with the help of his companions and a tool
*raises hand* David Tennant is right, his name is "The Doctor", but it's not wrong to call him "Doctor Who". Doctors One through Nine are called "DOCTOR WHO" in the credits! In fact, other former Doctors refer to him as "Doctor Who".