List of Doctor Who universe creatures and aliens
Overview
This is a list of fictional creatures and aliens from the universe of the long-running BBC
BBC
The British Broadcasting Corporation is a British public service broadcaster. Its headquarters is at Broadcasting House in the City of Westminster, London. It is the largest broadcaster in the world, with about 23,000 staff...

 science fiction television series
Science fiction on television
Science fiction first appeared on a television program during the Golden Age of Science Fiction. Special effects and other production techniques allow creators to present a living visual image of an imaginary world not limited by the constraints of reality; this makes television an excellent medium...

 Doctor Who
Doctor Who
Doctor Who is a British science fiction television programme produced by the BBC. The programme depicts the adventures of a time-travelling humanoid alien known as the Doctor who explores the universe in a sentient time machine called the TARDIS that flies through time and space, whose exterior...

, including Torchwood
Torchwood
Torchwood is a British science fiction television programme created by Russell T Davies. The series is a spin-off from Davies's 2005 revival of the long-running science fiction programme Doctor Who. The show has shifted its broadcast channel each series to reflect its growing audience, moving from...

, The Sarah Jane Adventures
The Sarah Jane Adventures
The Sarah Jane Adventures is a British science fiction television series, produced by BBC Cymru Wales for CBBC, created by Russell T Davies and starring Elisabeth Sladen...

 and K-9. It covers alien races and other fictional creatures, but not specific characters. Individual characters are listed in separate articles.

Note that some information on the page is taken from spin-off
Doctor Who spin-offs
Doctor Who spin-offs refers to material created outside of, but related to, the long-running British science fiction television series Doctor Who....

 media. The canonicity of this information is often uncertain.
The 4-5-6 served as the main antagonist
Antagonist
An antagonist is a character, group of characters, or institution, that represents the opposition against which the protagonist must contend...

s during the third series
Children of Earth
Children of Earth is the banner title of the third series of the British television science fiction series Torchwood, which broadcast for five episodes on BBC One in 2009. The series had new producer Peter Bennett and was directed by Euros Lyn, who had considerable experience on the revived Doctor...

 of Torchwood
Torchwood
Torchwood is a British science fiction television programme created by Russell T Davies. The series is a spin-off from Davies's 2005 revival of the long-running science fiction programme Doctor Who. The show has shifted its broadcast channel each series to reflect its growing audience, moving from...

.

They are unnamed aliens with whom the government of the United Kingdom made a deal in 1965; the 456 extorted twelve children in return for a cure to an Earth-bound virus which was about to mutate.
 
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