1968 (production)

January

 * January - Terrance Dicks was hired to the Doctor Who production team, as an assistant for Derrick Sherwin.
 * 6 January - Episode six of The Enemy of the World was recorded at Lime Grove Studios D. (TCH 11)
 * 8 January - Model filming for The Web of Fear took place at BBC Television Centre Puppet Theatre. (TCH 11)
 * 13 January - Episode one of The Web of Fear was recorded at Lime Grove Studios D. (TCH 11)
 * 14 January - Location filming for The Web of Fear concluded. (TCH 11)
 * 20 January - Episode two of The Web of Fear was recorded at Lime Grove Studios D. (TCH 11)
 * 27 January - Episode three of The Web of Fear was recorded at Lime Grove Studios D. (TCH 11)

February

 * 3 February - Episode four of The Web of Fear was recorded at Lime Grove Studios D. (TCH 11)
 * 10 February - Episode five of The Web of Fear was recorded at Lime Grove Studios D. (TCH 11)
 * 17 February - Episode six of The Web of Fear was recorded at Lime Grove Studios D. (TCH 11)
 * 24 February - Episode one of Fury from the Deep was recorded at Lime Grove Studios D. (TCH 12)

March

 * 2 March - Episode two of Fury from the Deep was recorded at Lime Grove Studios D. (TCH 12)
 * 9 March - Episode three of Fury from the Deep was recorded at Lime Grove Studios D. (TCH 12)
 * 16 March - Episode four of Fury from the Deep was recorded at Lime Grove Studios D. (TCH 12)
 * 23 March - Episode five of Fury from the Deep was recorded at Lime Grove Studios D. (TCH 12)
 * 29 March - The decision was made to reduce The Dominators from six parts into five.
 * 29 March - Episode six of Fury from the Deep was recorded at BBC Television Centre Studio 1. (TCH 12)

April

 * 19 April - The Mind Robber was extended from four parts into five, with Sherwin commissioned to write a new opening episode for the story.

June

 * 21 June - Episode one of The Mind Robber was recorded at BBC Television Centre Studio 3. (TCH 13)
 * 28 June - Episode two of The Mind Robber was recorded at BBC Television Centre Studio 3. (TCH 13) Frazer Hines was absent from this filming session due to being ill with chicken pox and Hamish Wilson temporarily stepped in as Jamie. (DCOM: The Fact of Fiction)

July

 * 5 July - Episode three of The Mind Robber was recorded at Lime Grove Studios D. (TCH 13)
 * 12 July - Episode four of The Mind Robber was recorded at Lime Grove Studios D. (TCH 13)
 * 19 July - Episode five of The Mind Robber was recorded at BBC Television Centre Studio 3. (TCH 13)

September

 * 20 September - Episode one of The Invasion was recorded at Lime Grove Studios D. (TCH 13)
 * 27 September - Episode three of The Invasion was recorded at Lime Grove Studios D. (TCH 13)

October

 * 4 October - Episode three of The Invasion was recorded at Lime Grove Studios D. (TCH 13)
 * 11 October - Episode four of The Invasion was recorded at Lime Grove Studios D. (TCH 13)
 * 18 October - Episode five of The Invasion was recorded at Lime Grove Studios D. (TCH 13)
 * 25 October - Episode six of The Invasion was recorded at Lime Grove Studios D. (TCH 13)

November

 * 1 November - Episode seven of The Invasion was recorded at Lime Grove Studios D. (TCH 13)