13 May 1938: birth of Milton Johns, who played Benik in The Enemy of the World (1967-68), Guy Crayford in The Android Invasion (1975), and Kelner in The Invasion of Time (1978).
13 May 1946: birth of Tim Piggot-Smith, who played Captain Harker in The Claws of Axos (1971) and Marco in The Masque of Mandragora (1976).
13 May 1949: birth of Zoe Wanamaker, who played Lady Cassandra in The End of the World (2005) and New Earth (2006).
13 May 1967: sixth episode of The Faceless Ones; last appearance of Michael Craze as Ben and Anneke Wills as Polly. The Doctor brokers a deal between Earth and the Chameleons, and departs with Jamie.
13 May 1972: broadcast of sixth episode of The Mutants. Ky is transformed into a superbeing and kills the Marshal; Sondergaard stays on to help the other Solonians transform.
13 May 2006: broadcast of Rise of the Cybermen. The Doctor, Rose and Mickey arrive in a parallel world where Rose's father is still alive and the Cybermen are coming.