The Sirius system was a binary star system located in Mutter's Spiral. The system had been the home to many sentient species during its history, including humans, Varlons, and Quagreegs, although only limited knowledge of interaction between these species is known.
Astronomical data Edit
Planets in the Sirius system included Sirius Alpha, (AUDIO: Max Warp) Androzani Major and Minor, (TV: The Caves of Androzani) Sirius IV, (TV: Frontier in Space) Sirius 5, (TV: City of Death) Sirius 7, (AUDIO: The Soers' Ditch) and Quagreeg. (AUDIO: Dead London)
Humans from different time periods in London, at least between the 1st century and 2008, were kidnapped by a Quagreeg called Sepulchre, and imprisoned within reenactment chambers in his mind. Quagreegs are the eponymous natives of their planet in the Sirius system. (AUDIO: Dead London)
During at least one point between 2068 and 2096, (TV: Nightmare of Eden) the Sirius system was a part of the Varlon Empire. The Sirius Exhibition Station was based there. During this time the Eighth Doctor and Lucie Miller visited and became embroiled in a murder investigation. (AUDIO: Max Warp)
By the 51st century, (PROSE: Diamond Dogs) the Sirius Conglomerate was a major power in the system, involved in activities on the planet Androzani Major, which held reserves of spectrox, a substance conferring longevity. (TV: The Caves of Androzani)