1986

June

 * 11 - Reed De Rouen, who played Pa Clanton in "The Gunfighters," dies.

September

 * 06 - The Mysterious Planet Episode 1 First Broadcast (The Trial of a Time Lord Episode 1)


 * 13 - The Mysterious Planet Episode 2 First Broadcast (The Trial of a Time Lord Episode 2)


 * 20 - The Mysterious Planet Episode 3 First Broadcast (The Trial of a Time Lord Episode 3)


 * 27 - The Mysterious Planet Episode 4 First Broadcast (The Trial of a Time Lord Episode 4)

October

 * 04 - Mindwarp Episode 1 First Broadcast (The Trial of a Time Lord Episode 5)


 * 11 - Mindwarp Episode 2 First Broadcast (The Trial of a Time Lord Episode 6)


 * 18 - Mindwarp Episode 3 First Broadcast (The Trial of a Time Lord Episode 7)


 * 25 - Mindwarp Episode 4 First Broadcast (The Trial of a Time Lord Episode 8)


 * 28 - Ian Marter, who played companion Harry Sullivan, dies from a diabetes-related heart attack in London.

November

 * 01 - Terror of the Vervoids Episode 1 First Broadcast (The Trial of a Time Lord Episode 9)


 * 08 - Terror of the Vervoids Episode 2 First Broadcast (The Trial of a Time Lord Episode 10)


 * 15 - Terror of the Vervoids Episode 3 First Broadcast (The Trial of a Time Lord Episode 11)


 * 22 - Terror of the Vervoids Episode 4 First Broadcast (The Trial of a Time Lord Episode 12)


 * 29 - The Ultimate Foe Episode 1 First Broadcast (The Trial of a Time Lord Episode 13)

December

 * 06 - The Ultimate Foe Episode 2 First Broadcast (The Trial of a Time Lord Episode 14)

Unknown date

 * John Flint, who played William des Preaux in "The Crusade" and Captain Urquhart in "Time-Flight," dies.

History of the Doctor Who Universe

 * Rose Tyler is born.
 * The events of The Tenth Planet occur at this time. The first recorded attack by Cybermen on Earth results in the destruction of the Cybermen's home planet, Mondas. The strain proves too much for the Doctor, however, who collapses and regenerates from his first incarnation into his second.