Vampire planet The vampire planet , or Vampires ' planet , ( PROSE : " Infinite Requiem " ) as it was called by the Seventh Doctor and his companion s , ( PROSE : " Blood Harvest " ) was a planet in E - Space used as a hiding place by the King Vampire , the last of the Great Vampire s . Features . According to the report by K9 , it was an isolated planet , habitable , with atmosphere and gravity approximate closely to Earth normal . One day was equivalent to 23 . 3 Earth hours and one year to 350 Earth days . Development . K9 Mark II reported it had high technological prowess but the peoples were primitive . This was due to the Three Who Rule ' s ban on advanced technology . The scans were likely registering the " Hydrax " as the high technology . The inhabitants did have some hidden technology such as radio transmitter s . ( TV : " State of Decay " ) While it was thought the inhabitants were brought to the world by the King Vampire , humanoid s existed on the world in a society of villages ruled by great houses . Once the King Vampire arrived , many of the royal families were tainted by the vampire curse . ( PROSE : " Blood Harvest " ) Landscape . The planet resembled a level 2 system . A village was the its most prominent feature . It was surrounded by forests . Further afield were caves used by the rebels . In the centre of the village was the " Hydrax " , which looked like a castle . Rock had built up around it so it appeared to be on a hill . Beneath it were caves containing the burial chamber of the King Vampire . ( TV : " State of Decay " ) Further afield still were several smaller settlements . One of these were the lands of Zarn , whose dwelling was known as the House of Zarn . ( PROSE : " The Eight Doctors " ) History . Fleeing the Eternal War , the King Vampire took the " Hydrax " , a human ship , as a source of blood . He travelled into E - Space through a Charged Vacuum Emboitment and took refuge on the planet . The King Vampire went underground beneath the " Hydrax " . Over time the ship was covered by earth and came to resemble a castle . A village grew around it . The villagers served the Three Who Rule , who were in turn subservient to the King . ( TV : " State of Decay " ) Visitors from other vilages became infected by the vampires and returned home to infect the other residents . Most , if not all , of these outlying villages had a vampire in control . ( PROSE : " The Eight Doctors " ) The Fourth Doctor , Romana II and Adric landed and were introduced to the Three Who Rule . Adric agreed to become one of them and Romana was taken as a sacrifice . Adric attempted to free her , but was himself taken a prisoner . The Doctor made contact with Kalmar ' s rebels and they attacked the castle . The Time of Arising came and the King began to rise from his chamber . The Doctor used a scout ship to impale and kill him . Without their ruler , the Three also died . ( TV : " State of Decay " ) Before he left , the Doctor , Romana and Adric attended a party with the rebels to celebrate their victory . Hurda convinced Romana to aid her sick child in another settlement . Romana was led into a trap and Zarn took her prisoner . The Eighth Doctor and the Fourth rescued her and Ivo killed Zarn . ( PROSE : " The Eight Doctors " )