1970

August

 * 20 - Ace, companion of the Seventh Doctor, is born in England. (DW: Ghost Light)

Unknown date

 * "Mary" kills Myra Bennett in order to consume her heart. Human authorities do not manage to catch her. (TW: Greeks Bearing Gifts)

January

 * 3 - DW: Spearhead from Space Episode 1, the first colour episode of Doctor Who, the first of Season 7 and the first starring Jon Pertwee as the Third Doctor is broadcast. It launches the "UNIT era" of the series. Beginning in 1970, the number of episodes produced in each season is reduced considerably, and the show moves from a Fall to Spring broadcast schedule to a January-June schedule.
 * 10 - DW: Spearhead from Space Episode 2 First Broadcast
 * 17 - DW: Spearhead from Space Episode 3 First Broadcast
 * 24 - DW: Spearhead from Space Episode 4 First Broadcast
 * 31 - DW: Doctor Who and the Silurians Episode 1 First Broadcast

February

 * 7 - DW: Doctor Who and the Silurians Episode 2 First Broadcast
 * 14 - DW: Doctor Who and the Silurians Episode 3 First Broadcast
 * 21 - DW: Doctor Who and the Silurians Episode 4 First Broadcast
 * 28 - DW: Doctor Who and the Silurians Episode 5 First Broadcast

March

 * 7 - DW: Doctor Who and the Silurians Episode 6 First Broadcast
 * 14 - DW: Doctor Who and the Silurians Episode 7 First Broadcast
 * 21 - DW: The Ambassadors of Death Episode 1 First Broadcast
 * 28 - DW: The Ambassadors of Death Episode 2 First Broadcast

April

 * 4 - DW: The Ambassadors of Death Episode 2 First Broadcast
 * 11 - DW: The Ambassadors of Death Episode 3 First Broadcast
 * 18 - DW: The Ambassadors of Death Episode 4 First Broadcast
 * 25 - DW: The Ambassadors of Death Episode 5 First Broadcast

May

 * 2 - DW: The Ambassadors of Death Episode 6 First Broadcast
 * 9 - DW: Inferno Episode 1 First Broadcast
 * 16 - DW: Inferno Episode 2 First Broadcast
 * 23 - DW: Inferno Episode 3 First Broadcast
 * 30 - DW: Inferno Episode 4 First Broadcast

June

 * 6 - DW: Inferno Episode 5 First Broadcast
 * 13 - DW: Inferno Episode 6 First Broadcast
 * 20 - DW: Inferno Episode 7 First Broadcast