1925

June

 * 11 - The Fifth Doctor, Tegan, Nyssa and Adric arrived at Cranleigh Hall in rural England for an afternoon of cricket. (DW: Black Orchid) Ace arrived shortly afterwards to obtain one of the segments of the Key to Time. Adric briefly flirted with her. She was unappreciative of his advances. (DWM: Time & Time Again)

Undated

 * Jack Harkness was active in this year, as shown by photos of him found in the CIA Archive. (TW: The New World)

January

 * 5 - Wolfe Morris (Padmasambhava in DW: The Abominable Snowmen) was born.

February

 * 18 - Russell Hunter, who played Kiy Uvanov in DW: The Robots of Death, was born.
 * 20 - George Waring (Arden in DW: The Ice Warriors) was born.

March

 * 2 - Bernard Price was born.
 * 7 - George A. Cooper, who played Cherub in DW: The Smugglers, was born in Leeds, England.
 * 26 - Barry Letts was born.
 * 28 - Morris Perry was born.
 * 29 - Frederick Treves was born.

April

 * 9 - Derek Murcott (Crito in DW: The Time Monster) was born.
 * 14 - William Lucas, who played Range in DW: Frontios, was born.

May

 * 14 - Tristram Cary was born.
 * 14 - Ysanne Churchman was born.
 * 14 - Gordon Gostelow was born.
 * 15 - Roy Stewart (Toberman in DW: The Tomb of the Cybermen and Tony in DW: Terror of the Autons) was born.

July

 * 10 - David Nettheim was born.
 * 17 - Hugh David was born.
 * 19 - Ivor Roberts was born.
 * 21 July - Lorne Cossette (Captain Maitland in DW: The Sensorites) was born.
 * 27 - Harry Towb (Osgood in DW: The Seeds of Death and McDermott in DW: Terror of the Autons) was born.

August

 * 11 - Brian Badcoe (Adam in DW: Invasion of the Dinosaurs) was born.
 * 18 - Brian Aldiss, writer of Umwelts for Hire, was born.

September

 * 2 - Neil Seiler (a Radio Operator in DW: The Sea Devils and Stewart in DW: Death to the Daleks) was born.
 * 19 - Dallas Cavell was born.
 * 22 - Stratford Johns was born.
 * 24 - Gary Downie was born.

November

 * 7 - John Stratton, who played Shockeye in DW: The Two Doctors, was born in Clitheroe, Lancashire, England, UK.
 * 11 - June Whitfield (Minnie Hooper in DW: The End of Time) was born.
 * 18 - News reporter Alex MacIntosh, who played himself in DW: Day of the Daleks, was born.

December

 * 24 - Doctor Who producer Innes Lloyd was born.

Unknown date

 * James Garbutt was born.
 * Neil Hallett was born.
 * Peter Thompson was born.
 * Construction of the eccentric Welsh resort village of Portmeirion began. Best known as the filming location for the 1960s TV series The Prisoner, the village was also used as a filming location for the Doctor Who serial The Masque of Mandragora.