As it came up in another thread, I thought a run-down of which missing episodes were recovered when might be useful for reference (Mods, if not, please delete).
First, the 'easy' early recoveries from within the BBC...
1978: 270 of the first 384 episodes missing (117/134 1st Doctor, 88/119 2nd Doctor, 65/128 3rd Doctor)
When the BBC archives first consolidated the Doctor Who episodes held by the Film Library and on video tape by the Engineering Department, the transmitted episodes from the first three Doctors in existence were as follows:
(1-1) An Unearthly Child: complete
(1-5) The Keys of Marinus episode 5
(2-2) The Dalek Invasion of Earth 5 (35mm transmission copy)
(2-4) The Romans 1&3
(2-5) The Web Planet 2
(2-6) The Crusade 3
(2-7) The Space Museum 3
(2-9) The Time Meddler 2
(3-6) The Ark 3
(3-8) The Gunfighters 4
(4-2) The Tenth Planet 1-3
(4-5) The Underwater Menace 3
(4-6) The Moonbase 2&4
(4-8) The Faceless Ones 1
(5-4) The Enemy of the World 3
(6-7) The Wheel in Space 6 (35mm transmission copy)
(6-1) The Dominators 1,2,4,5. (It's believed that the 35mm transmission copy of episode 3 was actually in existence at the time, but wasn't listed by mistake).
(6-2) The Mind Robber 5 (35mm transmission copy)
(6-3) The Invasion 2,3,5,6,7,8
(6-4) The Krotons 1 (35mm transmission copy), 2&3
(6-5) The Seeds of Death 1,2,4&6, plus 5 (35mm transmission copy)
(6-6) The Space Pirates 2 (35mm transmission copy)
(6-7) The War Games 2,5,8,9
(7-1) Spearhead from Space complete (16mm colour transmission print)
(7-2) The Ambassadors of Death 1 (625 line transmission video tape, as are all later episodes)
(8-3) The Claws of Axos 1&4
(8-5) The Daemons 4
(9-1) Day of the Daleks complete
(9-3) The Sea Devils 4-6
(9-4) The Mutants 3-6
(10-1) The Three Doctors complete
(10-2) Carnival of Monsters complete
(10-3) Frontier in Space 4&5
(10-4) Planet of the Daleks 1,2,4,5,6
(10-5) The Green Death complete
(11-1) The Time Warrior complete
(11-2) Invasion of the Dinosaurs 2-6
(11-3) Death to the Daleks 2-4
(11-4) The Monster of Peladon complete
(11-5) Planet of Spiders complete.
All later stories are complete (though sometimes salvaged from damaged tapes).
In theory, four other episodes which were transmitted from 35mm film should have existed at the film library, but had been junked before 1970 (The Daleks 4, Planet of Giants 3 [tx version], Power of the Daleks 5 and The Wheel in Space 5), along with one 16mm print which had been lent out and never returned (The Dalek Masterplan 4)
Mid 1978: 139 missing episodes (61,76,2)
Later in the year, a large find of missing or incomplete stories was recovered complete from BBC Enterprises, as black and white film prints.
(Season 1-2,3,5,6,7) The Daleks, The Edge of Destruction, The Keys of Marinus, The Aztecs, The Sensorites
(Season 2-1,2,3,4,5,7,8) Planet of Giants, The Dalek Invasion of Earth, The Rescue, The Romans, The Web Planet, The Space Museum, The Chase
(Season 3-6,8) The Ark, The Gunfighters
(Season 6-2,5) The Mind Robber, The Seeds of Death
(Season 7-2,3,4) The Silurians, The Ambassadors of Death, Inferno
(Season 8 - all ) Terror of the Autons, The Mind of Evil, The Claws of Axos, Colony in Space, The Daemons
(Season 9 - 2,3,4,5) The Curse of Peladon, The Sea Devils, The Mutants, The Time Monster
(Season 10-4&5) Frontier in Space, Planet of the Daleks
Around the same time, the British Film Institute returned copies of three season six stories which had been donated to them by Enterprises:
(Season 6-1,4,7) The Dominators, The Krotons, The War Games
First, the 'easy' early recoveries from within the BBC...
1978: 270 of the first 384 episodes missing (117/134 1st Doctor, 88/119 2nd Doctor, 65/128 3rd Doctor)
When the BBC archives first consolidated the Doctor Who episodes held by the Film Library and on video tape by the Engineering Department, the transmitted episodes from the first three Doctors in existence were as follows:
(1-1) An Unearthly Child: complete
(1-5) The Keys of Marinus episode 5
(2-2) The Dalek Invasion of Earth 5 (35mm transmission copy)
(2-4) The Romans 1&3
(2-5) The Web Planet 2
(2-6) The Crusade 3
(2-7) The Space Museum 3
(2-9) The Time Meddler 2
(3-6) The Ark 3
(3-8) The Gunfighters 4
(4-2) The Tenth Planet 1-3
(4-5) The Underwater Menace 3
(4-6) The Moonbase 2&4
(4-8) The Faceless Ones 1
(5-4) The Enemy of the World 3
(6-7) The Wheel in Space 6 (35mm transmission copy)
(6-1) The Dominators 1,2,4,5. (It's believed that the 35mm transmission copy of episode 3 was actually in existence at the time, but wasn't listed by mistake).
(6-2) The Mind Robber 5 (35mm transmission copy)
(6-3) The Invasion 2,3,5,6,7,8
(6-4) The Krotons 1 (35mm transmission copy), 2&3
(6-5) The Seeds of Death 1,2,4&6, plus 5 (35mm transmission copy)
(6-6) The Space Pirates 2 (35mm transmission copy)
(6-7) The War Games 2,5,8,9
(7-1) Spearhead from Space complete (16mm colour transmission print)
(7-2) The Ambassadors of Death 1 (625 line transmission video tape, as are all later episodes)
(8-3) The Claws of Axos 1&4
(8-5) The Daemons 4
(9-1) Day of the Daleks complete
(9-3) The Sea Devils 4-6
(9-4) The Mutants 3-6
(10-1) The Three Doctors complete
(10-2) Carnival of Monsters complete
(10-3) Frontier in Space 4&5
(10-4) Planet of the Daleks 1,2,4,5,6
(10-5) The Green Death complete
(11-1) The Time Warrior complete
(11-2) Invasion of the Dinosaurs 2-6
(11-3) Death to the Daleks 2-4
(11-4) The Monster of Peladon complete
(11-5) Planet of Spiders complete.
All later stories are complete (though sometimes salvaged from damaged tapes).
In theory, four other episodes which were transmitted from 35mm film should have existed at the film library, but had been junked before 1970 (The Daleks 4, Planet of Giants 3 [tx version], Power of the Daleks 5 and The Wheel in Space 5), along with one 16mm print which had been lent out and never returned (The Dalek Masterplan 4)
Mid 1978: 139 missing episodes (61,76,2)
Later in the year, a large find of missing or incomplete stories was recovered complete from BBC Enterprises, as black and white film prints.
(Season 1-2,3,5,6,7) The Daleks, The Edge of Destruction, The Keys of Marinus, The Aztecs, The Sensorites
(Season 2-1,2,3,4,5,7,8) Planet of Giants, The Dalek Invasion of Earth, The Rescue, The Romans, The Web Planet, The Space Museum, The Chase
(Season 3-6,8) The Ark, The Gunfighters
(Season 6-2,5) The Mind Robber, The Seeds of Death
(Season 7-2,3,4) The Silurians, The Ambassadors of Death, Inferno
(Season 8 - all ) Terror of the Autons, The Mind of Evil, The Claws of Axos, Colony in Space, The Daemons
(Season 9 - 2,3,4,5) The Curse of Peladon, The Sea Devils, The Mutants, The Time Monster
(Season 10-4&5) Frontier in Space, Planet of the Daleks
Around the same time, the British Film Institute returned copies of three season six stories which had been donated to them by Enterprises:
(Season 6-1,4,7) The Dominators, The Krotons, The War Games
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