Karn (Doctor Who)
Karn was a desolate planet located, like Gallifrey, in the constellation of Kasterborus. The Sisterhood dwelled there, guarding the Sacred Flame from which the Elixir of Life is distilled. The Renegade Time Lord Morbius also attacked the planet as a prelude to his conquest of Gallifrey.
When Morbius was destroyed (save his brain), the mad surgeon Mehenderi Solon set up shop in a Gothic-style castle on Karn, building him a new body. After Solon's maddened master destroyed him and was destroyed himself, Karn once more became the sole domain of the Sisterhood.