1969 (production)

January

 * 7 January - The BBC announced to the press that Patrick Troughton was to leave the role of the Second Doctor. It was also announced on the same day that Frazer Hines would be leaving the show too.

March

 * 25 March - Location filming for The War Games continued at Sheepcote Valley Rubbish Tip. (TCH 14)

May

 * 21 May - Jon Pertwee was cast as the Third Doctor.

June

 * 12 June - Final taping session for The War Games took place, marking the end of Patrick Troughton's regular involvement with the programme. It was also the last black and white taping session before the conversion to colour production.
 * 17 June - Jon Pertwee was introduced to the press as the Third Doctor in a special photo call at the BBC Pictorial Publicity building. He wore what he later described as his grandfather's old clothes: a velvet smoking jacket, a frilly shirt and an Inverness cape. He was accompanied by a Yeti. While Pertwee would maintain that this total accident inspired Christine Rawlins to create his iconic costume, Rawlins herself said that she was already inspired to do the same thing from observing the title character of.
 * 25 June - A full script was requested from David Whitaker for The Carriers of Death. He submitted two in July.

September

 * 13 September - Filming began on Spearhead from Space, the first story to feature Jon Pertwee as the Third Doctor. This launched colour production for Doctor Who, although in a one-off occurrence, the entirety of Spearhead from Space was shot on film, rather than the standard film/videotape mix which resumed with the second Pertwee story, Doctor Who and the Silurians.