The incorrect way to write or refer to the British television show Doctor Who. The abbreviated "Dr." implies that The Doctor has a phD, which he does not.
Hey, did you watch Dr. Who last Saturday?
Nope, but I watched Doctor Who!
The title and the name of the main character of a classic British TV show. First aired in 1963 till it’s cancellation in 1989. Became a made for TV movie in 1996. And in 2005 a new series aired.
See Doctor Who
"What are you watching?"
"The new Dr. Who"