Short Answer: He is simply "The Doctor."
Long Answer: Matt Smith is the 11th Doctor Who, following David Tennant as the 10th Doctor.
He is simply referred to as "The Doctor." He's a humanoid alien from a different universe, and is a "Time Lord" (meaning he's able to time-travel). Think of him as the Doctor of Time Travelling, if that makes it easier.
As the central question of the show is "Doctor WHO?," the Doctor's actual name has never been mentioned. It will not be until a later point in the show that the real name of the Doctor is revealed.
There are several "Doctors"- when one of them dies, the Doctor "regenerates" into a different person, although his soul is passed over from person-to-person.
It gets kind of funky. Thank the Brits for this one.
Matt smith (Doctor Who)
Matt Smith is the new Doctor.
Because he plays the main character who happens to be called the Doctor. And everyone asks 'Doctor Who?' because they want to know who he is
No, David Tennant plays the Doctor in that episode. Matt Smith isn't in it.
Yes, he is.
The first episode of series 5 is called The Eleventh Hour.
Yes, Matt Smith is currently portraying the Doctor in Doctor Who.
The new doctor is Matt Smith.
Matt smith (Doctor Who)
Matt Smith is the new Doctor.
Matt Smith
Matt Smith
Because he plays the main character who happens to be called the Doctor. And everyone asks 'Doctor Who?' because they want to know who he is
No, David Tennant plays the Doctor in that episode. Matt Smith isn't in it.
Series 5 (Matt Smith's first Episode)
Matt Smith is the eleventh Doctor.
Matt Smith.