18 February 1967: birth of Guy Ferland, director of three of the Torchwood: Miracle Day episodes (2011).
18 February 1993: death of Jacqueline Hill, who played the First Doctor companion Barbara Wright from 1963 to 1965 (she is the first regular cast member to actually appear on screen), and then returned to play Lexa in Meglos (Fourth Doctor, 1980).
18 February 2012: death of Peter Halliday, who played a number of roles in Old Who including Vaughn's security chief Packer in The Invasion (Second Doctor, 1968), Pletrac in Carnival of Monsters (Third Doctor, 1973) and the blind vicar Parkinson in Remembrance of the Daleks (Seventh Doctor, 1988).
ii) broadcast anniversaries
18 February 1967: broadcast of second episode of The Moonbase. The Doctor works out that the Cybermen have been poisoning the sugar.
18 February 1978: broadcast of third episode of The Invasion of Time. The Vardans take over; Leela and Rodan contact the Shobogans; Andred threatens to kill the Doctor.