New to Doctor Who or returning after a break? Check out our guides designed to help you find your way!



You may be looking for the audio series.

Kaldor City, often shortened to just Kaldor, was one of three human colonies on Kaldor, established some point by the 29th century. (TV: The Robots of Death, PROSE: Corpse Marker)

According to one account, Kaldor was in fact Japetus, one of the moons of Jupiter, (PROSE: Legacy) but most other sources agree that it was a planet outside of Earth's Solar System. (AUDIO: Occam's Razor, COMIC: Crisis on Kaldor)

In effect, the Founding Families (as the initial terraformers called themselves) became well established as the governing body of Kaldor by the 39th century. (PROSE: Legacy)

Kaldor was situated on the edge of a vast sandy desert. The city itself was surrounded by the Outer Zones, which were inhabited by less wealthy members of society. The richer businessmen of Kaldor made their living running the sandminers that searched the desert for minerals such as zelanite, keefan, and lucanol (which was most prized), effectively giving the Kaldor City Company control of Kaldor. (AUDIO: Occam's Razor)

By the 39th century, minerals were sent to Io for distribution throughout the Galactic Federation. (PROSE: Legacy)

The Kaldor civilisation consisted of humans and the Kaldor android servants that tended to their whims and helped manage the sandminers. (TV: The Robots of Death)

In the more poverty-stricken parts of Kaldor City, hotels were constructed to tend to the needs of certain civilians. Some of these needs included programming robots to adopt a motherly status, while adult clients behaved in an infantile fashion and adapted childish, baby-like behaviours to fulfil hobbies. (AUDIO: Circuit Breaker)

While the people of Kaldor were aware that they were descended from off-world colonists, by the 29th century they purposefully isolated themselves from any contact with other planets for generations, as the Company feared that it might lead to loss of profits. (AUDIO: Occam's Razor)

Later, however, the people of Kaldor were in contact with other planets, such as Ventalis, to which the Company sold robots. (AUDIO: Robophobia)

The Fourth Doctor and Leela once visited the planet and became involved in a plot by Taren Capel to make the robots kill all humans. (TV: The Robots of Death)

Centuries after the colonisation of Kaldor, a UV-1 robot began to reprogram Super-Vocs to turn against humans, but this plan was stopped. (COMIC: Crisis on Kaldor)

In 2889, Kaston Iago committed a series of random murders in Kaldor City so that Kiy Uvanov would hire him as a bodyguard. (AUDIO: Occam's Razor)

Behind the scenes[]

  • The comic Crisis on Kaldor has the Doctor stating the planet's name to be Kaldor, while the name was previously only thought to be applied to the city. Legacy claimed that Kaldor City is on Japetus, but this is contradicted by both earlier and later stories.
  • Kaldor City was later the subject of the audio series Kaldor City.
  • In the book 100 Scariest Monsters, Kaldor is misspelled Caldor.