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Doctor Who is a BBC science-fiction TV show. It first aird from 1963-89, then revived in 2005.
The show follows an alien known only as "The Doctor" who has a time machine disguised as a 1950's Police Box. It is much bigger on the inside, and is known as the TARDIS. The Doctor's species is "Time Lord". They have the ability to regenerate (a process by which they change their bodies when they are fatally injured to escape death; each Time Lord has a maximum of 12 regenerations).
The Doctor usually travels in the company of humans, at least one of which is always a young, often attractive female. They travel through time and space, saving planets, rescuing civilizations, defeating monsters, righting wrongs and doing an awful lot of running.
The revived series is one of the best series of anything ever created by the hands of man, and the opening titles sequence of series 1-4 was INCREDIBLE. However, the 5th series was widly regarded as crap, and, contrary to popular belief, this had nothing to do with the new actor playing The Doctor. It was mainly due to the craptacular and cheap new opening sequence, the mediocre and boring new theme, unexciting plots, unecessary and bad redesigning of most aspects of the series, lack of recurring characters, consistent plot holes and continuity errors, and most of all, the HORRIFIC mutilation of the Daleks, who had, up until series 5, been perfect in their design, but were terribly redesigned in series 5.
1) "Wow! That episode of Doctor Who was so cool! Did you see the Sontaran ship explode? It was awesome!"

2) "Man! That episode was crap! Why did they redesign the Daleks? Now they look like obese telletubbies!
by imjustchillin April 19, 2011
Same as Dr. Who

The Doctor is a Time Lord, an extraterrestrial from the planet Gallifrey, who travels in a time machine called the TARDIS.

Sometimes he is accompanied by companions who have chosen to travel with him for a variety of reasons.

Although he physically resembles a human, as a Time Lord his physiology is different. Once a Time Lord suffers a mortal injury, illness, or old age, he uses the ability to regenerate.
"What did you say your name was?"

"I told you; The Doctor."

"Yeah, but, Doctor who?"

"Just The Doctor."
by Stefani Bigaran August 22, 2005
The Show. Doctor who is a popular science fiction series, which has run for 43 years as of this date. Started in 1963, it ran to 1989 when it was put on hiatus. Besides a TV movie, the only new Doctor who was in books, audio and webcasts for 16 years. The series started back up in 2005, and has been running since.

The Doctor. The Doctor is a Timelord from Gallifrey, which in the recent series has been revealed to be destroyed. He usually saves the Earth/The Universe/Civilisation as we know it on a day-to-day basis. Generally talks alot, though it varies from regeneration to regeneration. Often, no, almost always has a compainion (A friend - not that way either.) travelling with him. Want to know more? Wiki has a large article on it which can explain it better than i can. Just look up 'Doctor who'
1. What do you mean youve never seen Doctor who?

2. The Doctor saved the universe again. Man, and I thought i was accoplished.
by Meglomaniac April 25, 2007
The show that breaks you down, tosses you around, punches you in the feels, and supports and smashes your OTP.
Mom: Get off of your laptop, let's go!

Whovian: 10nth used to say "Allons-y", which meant "Let's go" in French.

Mom: Forget about the Doctor Who stuff.

by Fellow Whovian January 06, 2013
A traveller who's the last of a noble race known as Time Lords. Sometimes he has companions, but they never stay along forever. They age and eventually die, and he has to move on.

He's the most fantastically good man throughout all of time and space, and yet he gets so little.

At the end of the day, he's just an oft lonely man who travels around the universe in a little blue box. And that's what makes him so brilliant.
"Who are you?"
"I'm the Doctor."
"The Doctor? Doctor who?"
by Thomas Robert Pietrzyk July 13, 2008
The one question that can never be answered in the hit BBC Scifi drama!
"Doctor who, exactly?"
by geekgirl666 October 18, 2011
Doctor Who is a TV show, made by the BBC, that shows a Time Lord called The Doctor travelling in time using his TARDIS (Time And Relative Dimension(s)In Space.
No examples available for "Doctor Who"
by Chris C!! November 26, 2008
The hit British series about a thousand year old alien who travels with humans in a blue box that's bigger on the inside. It's fans are called Whovians. Don't be fooled, though it seems like a cheerful show, it will make you cry like you're three again and it will ruin your life. It will change your life. You'll become obsessed, and it will become the center of your life. It's a beautiful show and anyone who likes sci-fi, lighthearted humor and doesn't mind being emotionally unstable will love it. Give it a shot, go on. Allons-y!
Whovian: I love Doctor Who, it's brilliant!
Friend: I know. It's all you talk about.
Whovian: Because... Doctor Who... SO GOOD.
by MadmanWithABox December 29, 2012