Androzani Major

Androzani Major and Androzani Minor are a pair of planets that form the setting of the serial (DW: The Caves of Androzani). Androzani Minor features a network of caves, inhabited by spectrox-producing giant bats. When the planet moved closer to Androzani Major, mud burst from Androzani Minor's core. The planets are located in the Sirius system. Both planets were once covered by water but have become hot and arid desert planets. Native life on Androzani Minor includes the Magma Beast, which lives in Androzani Minor's bubbling mud pools.

It was colonised by Earth and the Doctor visited the planet during its early days. Centuries later, it possessed a federal government, with a ruling body called the Presidium headed by a President and an army called the "federal forces". The Conglomerate's chairman, Morgus, had great influence over the Presidium and was influential enough for the army's commanding officer on Minor to pass information on to him before the President. Spectrox, a chemical that could slow down ageing, was a major commodity.

When Sharaz Jek cut off supply of Spectrox, the federal forces tried to retake Minor and the Spectrox, while Major's population and government panicked over the loss. Around this time, Morgus had also been laying off much of his workforce, and the unemployment was causing disruption on Major. The crisis ended with the deaths of the President and Morgus.