Doctor Who is a long-running British
science-fiction television series that began in 1963. Its protagonist,
The Doctor, is an alien who travels through time and space in a ship known as the
TARDIS, as well as their travelling
companions. 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
alien species and antagonists. The Yeti appear twice in
the fifth season of
Doctor Who as adversaries of the Doctor's
second incarnation (
Patrick Troughton). They are introduced in the 1967 serial
The Abominable Snowmen guarding a cave near a
Buddhist monastery in the
Himalayas, scaring or killing travellers. The Yeti robots are protecting a pyramid of spheres that house the
Great Intelligence, a disembodied entity with mysterious origins, The Yeti then subjugate London and engulf the
Underground in a web-like
fungus. The only resistance offered is by a band of soldiers, led first by Captain Knight (
Ralph Watson) and then by a colonel named
Lethbridge-Stewart (
Nicholas Courtney), with scientific support provided by Travers, his daughter Anne Travers (
Tina Packer) and later the Doctor. The invasion of the London Underground is revealed as a trap designed to draw in the Doctor so that the Great Intelligence can drain the Doctor's mind, but the Intelligence is again defeated and banished, rendering all the Yeti dormant once again. A Yeti is one of the creatures featured in the 1983 episode "
The Five Doctors" where it is encountered by the Second Doctor and Lethbridge-Stewart, who is now a
Brigadier, as they cross through the Death Zone, an ancient arena used by the
Time Lords, the Doctor's species, to pit aliens from across time and space against each other. The Yeti is one of the aliens that is present in the Death Zone, stated to be a leftover from a prior game. It attacks the pair, but the Doctor is able to use
fireworks to cause a
rockfall, separating them from the Yeti. Though the Great Intelligence would return to the
seventh series of
Doctor Whos 2005 revival, the Yeti did not return. The Intelligence created several new servants, including the
Snowmen,
Spoonheads, and
Whisper Men. These creatures diverged significantly from the Yeti: the Snowmen were sentient
snowmen, the Spoonheads were robots that harvested human minds using the
Wi-Fi, and the Whisper Men were faceless humanoids in
Victorian fashion that whisper dark
nursery rhymes under their breath.
Spin-off media Yeti and the Great Intelligence are featured in the 1995 spin-off
direct-to-video film
Downtime, produced by
Reeltime and featuring
Victoria Waterfield (
Deborah Watling), Brigadier Lethbridge-Stewart (Nicholas Courtney) and
Sarah Jane Smith (
Elisabeth Sladen) with a now deceased Professor Travers (Jack Watling) serving as a vessel for the Intelligence. The Yeti are once again used as the Intelligence's minions, and the Intelligence is able to use control spheres to turn humans into Yeti. The Yeti appear as antagonists in several novels in the
Lethbridge-Stewart book series, depicting stories starring the Brigadier. The Yeti also appear in the 1995 novel
Millennial Rites by
Craig Hinton, where the Intelligence merges with an entity from another dimension, creating an altered London; the Intelligence constructs Yeti in this dimension to act as its servants. The Yeti appear in audio drama stories
The Web of Time and
Time of the Intelligence, again as the Intelligence's foot-soldiers. ==Conception and development==