1968

May

 * Jack Harkness is present for the Parisian student riots. (TWM: The Book of Jahi)

December

 * 20 - Cristian Alvarez meets the Doctor in London. (NA: The Left-Handed Hummingbird)
 * 23 - The Sentience begins stirring in Crook Marsham. (NA: Nightshade)
 * 24 - The Doctor and Ace arrive in Crook Marsham, and become involved in the fight against the Sentience. (NA: Nightshade)
 * 25 - The final battle against the Sentience takes place. It departs Crook Marsham. (MA: Nightshade)

Unknown dates

 * The United Nations have by this time established protocols for first contact with alien life. (DW: The Sound of Drums)
 * The Monk deposits &pound;200 in a London bank, planning to withdraw it with compound interest in two hundred years (DW: The Time Meddler).
 * The Olympics are held in Mexico City (DW: The Underwater Menace).

January

 * 06 - The Enemy of the World Episode 3 First Broadcast


 * 13 - The Enemy of the World Episode 4 First Broadcast


 * 20 - The Enemy of the World Episode 5 First Broadcast


 * 27 - The Enemy of the World Episode 6 First Broadcast. The episode is followed by a specially shot scene of the Doctor addressing the viewers about the events of the next story.

February

 * 03 - The Web of Fear Episode 1 First Broadcast


 * 10 - The Web of Fear Episode 2 First Broadcast


 * 17 - The Web of Fear Episode 3 First Broadcast. First appearance of Nicholas Courtney as Col. (later Brigadier) Alistair Gordon Lethbridge-Stewart, a character that will become a consistent part of the Doctor Who universe for the next 40 years.


 * 24 - The Web of Fear Episode 4 First Broadcast

March

 * 02 - The Web of Fear Episode 5 First Broadcast


 * 09 - The Web of Fear Episode 6 First Broadcast


 * 16 - Fury from the Deep Episode 1 First Broadcast


 * 23 - Fury from the Deep Episode 2 First Broadcast


 * 30 - Fury from the Deep Episode 3 First Broadcast

April

 * 06 - Fury from the Deep Episode 4 First Broadcast


 * Keith Pyott, who played Autloc in "The Aztecs," dies.


 * 13 - Fury from the Deep Episode 5 First Broadcast


 * 20 - Fury from the Deep Episode 6 First Broadcast. Deborah Watling leaves the series with this episode.


 * 27 - The Wheel in Space Episode 1 First Broadcast

May

 * 04 - The Wheel in Space Episode 2 First Broadcast. Debut of Wendy Padbury as new companion Zoe Heriot.


 * 11 - The Wheel in Space Episode 3 First Broadcast
 * 12 - Catherine Tate (Donna Noble) is born.
 * 18 - The Wheel in Space Episode 4 First Broadcast


 * 25 - The Wheel in Space Episode 5 First Broadcast


 * 28 - Kylie Minogue (Astrid Peth in DW: Voyage of the Damned) is born

June

 * 01 - The Wheel in Space Episode 6 First Broadcast. The episode ends with the Doctor proceeding to show Zoe a recording of a recent adventure, leading into a rebroadcast of The Evil of the Daleks which will fill the gap before the start of the next season.

August

 * 5 - Matt Jones, best known in the Doctor Who world for writing the Doctor Who episodes The Impossible Planet/The Satan Pit and the Torchwood episode Dead Man Walking, is born.


 * 10 - The Dominators Episode 1 First Broadcast


 * 17 - The Dominators Episode 2 First Broadcast


 * 24 - The Dominators Episode 3 First Broadcast


 * 31 - The Dominators Episode 4 First Broadcast

September

 * Publication of the fourth Doctor Who Annual.


 * 07 - The Dominators Episode 5 First Broadcast


 * 14 - The Mind Robber Episode 1 First Broadcast


 * 21 - The Mind Robber Episode 2 First Broadcast


 * 28 - The Mind Robber Episode 3 First Broadcast

October

 * 05 - The Mind Robber Episode 4 First Broadcast


 * 12 - The Mind Robber Episode 5 First Broadcast

November

 * 02 - The Invasion Episode 1 First Broadcast. Terrance Dicks' long association with the Doctor Who franchise begins with this episode, on which he serves as script editor. Although the character is not yet identified by name, John Levene makes his debut as John Benton.


 * 09 - The Invasion Episode 2 First Broadcast, in which UNIT is officially introduced. Alistair Gordon Lethbridge-Stewart appears as a brigadier for the first time, though he won't become a regular until 1970.


 * 16 - The Invasion Episode 3 First Broadcast


 * 23 - The Invasion Episode 4 First Broadcast; this is also the show's 5th anniversary.


 * 30 - The Invasion Episode 5 First Broadcast

December

 * 07 - The Invasion Episode 6 First Broadcast


 * 14 - The Invasion Episode 7 First Broadcast


 * 21 - The Invasion Episode 8 First Broadcast


 * 28 - The Krotons Episode 1 First Broadcast