List of Doctor Who universe creatures and aliens
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Doctor Who, a long-running British science fiction television series, has many creatures and aliens that exist in its fictional universe. Beginning in 1963, the show ran until 1989, at which point it was cancelled. It was later revived in 2005. The series stars its protagonist, the Doctor, an alien who travels through time and space in a ship known as the TARDIS, as well as their travelling companions, as they explore the universe. When the Doctor dies, they are able to undergo a process known as "regeneration", completely changing the Doctor's appearance and personality. Throughout their travels, the Doctor often comes into conflict with various creatures and alien species, with many of them serving as both supporting characters and as antagonists. These creatures are often dubbed "monsters" by fans of the series. This list covers alien races and other fictional creatures from the show's universe, as well as from several of its spin-off series, such as The Sarah Jane Adventures, Torchwood, and Class, in chronological order of their first appearance.
Initially an educational show, the introduction of the Daleks in the show's second story saw Doctor Who gain a ratings spike. More monsters were made to attempt to capitalise off the Daleks' success and subsequently became a larger focus within the series, notably during the period where Patrick Troughton acted as the Second Doctor.
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