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Picture shows Matt Smith as the Eleventh Doctor in the 50th Anniversary Special Of "Doctor Who" - The Day of the Doctor (Photo by Adrian Rogers)

On Nov. 23, 1963, British television premiered a new science fiction series about the adventures of a quirky time-traveling alien known only as "the Doctor." "Doctor Who" has since become the longest-running sci-fi television show in history, with a fan base that crosses generations.

At 2:50 p.m. local time, Saturday, "Doctor Who" fans, known as "Whovians" will don their bow ties, grab their sonic screwdrivers and celebrate 50 years of "Doctor Who" as the BBC simulcasts the anniversary special throughout the world. The Regal Destiny USA theaters will screen an encore presentation of the show in 3D, for one night only, at 7:30 and 10 p.m. on Monday, Nov. 25.

If you're new to the show, or haven't watched since you were a kid, take a look at our infographic to learn a few basics about the Doctor.

Think you know "Who?" Try our quiz to find out.