anchor.diff:  4|34|The Macra Terror|100|https://en.wikipedia.org/wiki/The_Macra_Terror|The TARDIS lands on a human colony world where everyone appears to be happy.|Lost
   4|35|The Faceless Ones|150|https://en.wikipedia.org/wiki/The_Faceless_Ones|The TARDIS arrives in the landing path of a plane at Gatwick airport.|Partially Lost
   4|36|The Evil of the Daleks|175|https://en.wikipedia.org/wiki/The_Evil_of_the_Daleks|Battle rages from Victorian England to Skaro where the Daleks seem finished.|Partially Lost
  -5|37|The Tomb of the Cybermen|100|https://en.wikipedia.org/wiki/The_Tomb_of_the_Cybermen|The Doctor, Jamie and  Victoria find an archealogical dig on of Telos.|
  +5|37|The Tomb of the Cybermen|100|https://en.wikipedia.org/wiki/The_Tomb_of_the_Cybermen|An archealogical dig on Telos investigates the long-dead Cybermen.|
   5|38|The Abominable Snowmen|150|https://en.wikipedia.org/wiki/The_Abominable_Snowmen|The Doctor is delighted when the TARDIS returns him to the Himalayas in 1935.|Partially Lost
   5|39|The Ice Warriors|150|https://en.wikipedia.org/wiki/The_Ice_Warriors|The Doctor arrives on Earth during a new ice age and meets the Ice Warriors.|Partially Lost
   5|40|The Enemy of the World|150|https://en.wikipedia.org/wiki/The_Enemy_of_the_World|The Doctor discovers he has a double: a powerful politician called Salamander.|
  
positive.code: 11|74|Planet of the Spiders|150|https://en.wikipedia.org/wiki/Planet_of_the_Spiders|Giant Spiders and Mike Yates feature in the Third Doctor's swansong.|
  12|75|Robot|100|https://en.wikipedia.org/wiki/Robot_%28Doctor_Who%29|After his regeneration, the Doctor investigates the robbery of top secret plans.|
  12|76|The Ark in Space|100|https://en.wikipedia.org/wiki/The_Ark_in_Space|The TARDIS materialises aboard the Ark, a space station in orbit around Earth.|
  12|77|The Sontaran Experiment|50|https://en.wikipedia.org/wiki/The_Sontaran_Experiment|The Doctor, Sarah and Harry arrive on Earth which is now a desolate wilderness.|
  12|78|Genesis of the Daleks|150|https://en.wikipedia.org/wiki/Genesis_of_the_Daleks|The Time Lords foresee Daleks conquering the Universe, and send the Doctor to stop them.|
  12|79|Revenge of the Cybermen|100|https://en.wikipedia.org/wiki/Revenge_of_the_Cybermen|The time ring returns the Doctor, Sarah and Harry to space station Nerva.|
  13|80|Terror of the Zygons|100|https://en.wikipedia.org/wiki/Terror_of_the_Zygons|Oil rigs off Scotland are being attacked by the Loch Ness monster.|
  
negative.code: 15|97|The Invasion of Time|150|https://en.wikipedia.org/wiki/The_Invasion_of_Time|The Sontarans invade Gallifrey.|
  16|98|The Ribos Operation|100|https://en.wikipedia.org/wiki/The_Ribos_Operation|To restore cosmic balance, the White Guardian requires the Key to Time.|
  16|99|The Pirate Planet|100|https://en.wikipedia.org/wiki/The_Pirate_Planet|The tracer leads to planet Calufrax in search of the second segment of the Key.|
  16|100|The Stones of Blood|100|https://en.wikipedia.org/wiki/The_Stones_of_Blood|The tracer points to a stone circle on Boscombe Moor, where druids await the Doctor.|
  16|101|The Androids of Tara|100|https://en.wikipedia.org/wiki/The_Androids_of_Tara|In search of the fourth segment of the Key to Time, the TARDIS lands on Tara.|
  16|102|The Power of Kroll|100|https://en.wikipedia.org/wiki/The_Power_of_Kroll|In search of the fifth segment of the Key to Time, Romana is taken by Swampies.|
  16|103|The Armageddon Factor|150|https://en.wikipedia.org/wiki/The_Armageddon_Factor|In search of the final segment of the Key to Time, the TARDIS lands on Atrios.|
  