The Hydrax crossed from N-Space into E-Space, where the crew found a primitive planet. Turned into vampires by the Great Vampire, they controlled the natives for a thousand years until the arrival of the Fourth Doctor, who killed the Great Vampire and the Three Who Rule. She aged, decayed and crumbled into dust. (TV: State of Decay) A clone of Camilla was later developed. (PROSE: Blood Harvest)