5 February 1966
Jackie Lane (Dodo Chaplet), Eric Thompson (Gaston), David Weston (Nicholas), John Tillinger (Simon), Edwin Finn (Landlord), Christopher Tranchell (Roger), Erik Chitty (Preslin), Annette Robertson (Anne), Clive Cazes (Captain of the Guard), Reginald Jessup (Servant), André, Morell (Marshal Tavannes), Leonard Sachs (Admiral de Coligny), Cynthia Etherington (Old Woman), Joan Young (Catherine de Medici), Barry Justice (Charles IX), Michael Bilton (Teligny), Norman Claridge (Priest), Will Stampe (1st Man), Ernest Smith (2nd Man), John Slavid (officer), Jack Tarran (1st Guard), Leslie Bates (2nd Guard)
|Written by||John Lucarotti/Donald Tosh|
|Directed by||Paddy Russell|
|Produced by||John Wiles|
Paris 1572: the Catholic Queen Mother Catherine de Medici is planning to kill all the Protestants in France. The TARDIS crew rescue a servant girl, Anne, who has overheard the plot being hatched. Together, they try to warn the Protestants, but their warnings fall on deaf ears.