Proxima Major was a planet in the Proxima System.

Proxima Major had a temperate climate, with a tropical equatorial area. However, the Conglomerate's experiment to create the Quantum Gateway shifted its orbit so it was freezing. (AUDIO: The Dalek Contract) After the Gateway was closed, the planet returned to its original orbit. (AUDIO: The Final Phase)

The homeworld of Alby Brook was Proxima Major. He came from a broken home and was involved in crime as a youth there. (AUDIO: The Human Factor)