Alpha Centauri was the home planet of the Alpha Centauran race. It was also a part of the Galactic Federation and served as its headquarters in 3375. (TV: The Curse of Peladon, The Monster of Peladon, PROSE: The Dark Path)
When the Cybermen allied with Rassilon to rewrite all of history, Alpha Centauri was rendered lifeless by Cyberman forces. This version of history was undone by the Twelfth Doctor and Rassilon. (COMIC: Supremacy of the Cybermen)
When the Second Doctor landed in Australia in 2018, he was actually trying to get to either William Shakespeare's house in Stratford or the Pan-Galactic Games on Alpha Centauri, as Jamie McCrimmon had wanted some excitement and spectacle. (PROSE: Timewyrm: Apocalypse)
Behind the scenes
- An invalid reference to Alpha Centauri occurs in a Doctor Who mini-scene broadcast in 2009 during the talent show Tonight's the Night, in which Jack Harkness states he once went to a party there.
- In the story of Doctor Who: Legacy, the Eighth Doctor mentions humanity spreading to Alpha Centauri.
- According to The Monster Vault, Alpha Centaurans developed skills in politics due to their home planet not having any natural predators, being able to focus on politeness.