23 September

History of the Doctor Who Universe

 * 1215 - Kublai Khan is born and will later meet the Doctor and companions in DW: Marco Polo.

History of Doctor Who

 * 1967 - DW: The Tomb of the Cybermen Episode 4 first broadcast.


 * 1978 - DW: The Ribos Operation Episode 4 first broadcast.


 * 2006 - Patrick Tull (One of the voices of the Krotons in DW: The Krotons) dies.