BBC
Soundtracks to ALL missing episodes exist and have been released commercially as part of the BBC Radio Collection.
With a number of missing episodes brief clips do still exist. Visit the Doctor Who Clips List for a detailed break-down of what remains.
For many missing episodes a visual documentation in the form of telesnaps exist, taken by John Cura off-air.
In 2006 animation studio Cosgrove Hall produced official animated versions of episodes one and four of The Invasion for the 2| entertain DVD release. Brief clips of other missing episodes have also been animated by Garrett Gilchrist and you can view them here.
The First Doctor
Season one (1963-4)
Marco Polo – all seven episodes missin. Telesnaps exist for all but episode four.
The Reign of Terror – episodes 4 and 5 (out of six) missing.
The Crusade – episodes 2 and 4 (out of four) missing.
Season three (1965-6)
Galaxy Four – all four episodes missing.
Mission to the Unknown – single episode story, missing.
The Myth Makers – all four episodes missing.
The Daleks’ Master Plan – episodes 1, 3, 4, 6, 7, 8, 9, 11 and 12 (of twelve episodes) missing.
The Massacre – all four episodes missing.
The Celestial Toymaker – episodes 1, 2 and 3 (out of four) are missing.
The Savages – all four episodes missing. Telesnaps exist for all four episodes.
Season four (1966)
The Smugglers – all four episodes missing. Telesnaps exist for all four episodes.
The Tenth Planet – episode 4 (out of four) missing. Telesnaps exist.
The Second Doctor
Season four continued (1966-7)
The Power of the Daleks – all six episodes missing. Telesnaps exist for all six episodes.
The Highlanders – all four episodes missing. Telesnaps exist for all four episodes.
The Underwater Menace – episodes 1, 2 and 4 (out of four) missing. Telesnaps exist for all missing episodes.
The Moonbase – episodes 1 & 3 (out of four) missing. Telesnaps exist for both missing episodes.
The Macra Terror – all four episodes missing. Telesnaps exist for all four episodes.
The Faceless Ones – episodes 2, 4, 5 & 6 (out of six) missing. Telesnaps exist for all missing episodes.
The Evil of the Daleks – episodes 1, 3, 4, 5, 6, and 7 (out of seven) missing. Telesnaps exist for all missing episodes.
Season five (1967-8)
The Abominable Snowmen – episodes 1, 3, 4, 5 and 6 (out of six) missing. Telesnaps exist for all missing episodes.
The Ice Warriors – episodes 2 and 3 (out of six) missing. Telesnaps exist for all missing episodes.
The Enemy of the World- episodes 1, 2, 4, 5 and 6 (out of six) missing. Telesnaps exist for all but episode four of the missing episodes.
The Web of Fear – episodes 2, 3, 4, 5 and 6 (out of six) missing. Telesnaps exist for all missing episodes.
Fury from the Deep – all six episodes missing. Telesnaps exist for all six episodes.
The Wheel in Space – episodes 1, 2, 4 and 5 (out of six) missing. Telesnaps exist for all missing episodes.
Season six (1968-9)
The Invasion – episodes 1 and 4 (out of eight) missing. Cosgrove Hall produced animated versions of both episodes for the 2| entertain DVD release.
The Space Pirates – episodes 1, 3, 4, 5 and 6 (out of six) missing.