The five companions from the new series (2005-present) that have stayed on the show for a duration of at least one season.
Who are Rose, Martha, Donna, Amy and Rory?
100
This race of villains has appeared regularly on the show since its second serial in 1964. They live to "exterminate" anyone that is not of their kind.
What are the Daleks?
100
Doctor Who's two authorized spin-off TV series.
What is Torchwood and The Sarah Jane Adventures?
100
The acronym TARDIS, the Doctor's time machine, stands for this...
What is "Time And Relative Dimension in Space"?
200
Humans are born with two arms, armpits, legs, ears, eyes, nostrils, lungs, kidneys, and so on. Time Lords such as the Doctor are also born with two _____.
What are hearts?
200
The Doctor's first companion.
Who is Susan (the Doctor's grand-daughter)?
200
This villain is a Time Lord, a childhood friend-turned-enemy of the Doctor.
Who is the Master?
300
The Doctor's home planet.
What is Gallifrey?
300
As a parting gift, the Doctor gave this past companion his robot dog, K9.
Who is Sarah Jane Smith?
300
This race of villains has the appearance of a suit of metal, and they function using the human brain plugged into them.
What are the Cybermen?
400
A catchphrase of the Tenth Doctor.
What is "Allons-y!", "I'm sorry. I'm so sorry.", "Well...", or "Brilliant!"?
400
This companion traveled with the Doctor for more adventures than any other companion: 23 total.
Who is Rose Tyler?
500
In the early 1970s, the Doctor was exiled on Earth by the Time Lords, and during this time he worked for this organization.
What is UNIT?
500
This is the only companion of the new series who left the Doctor by himself / herself.