10 January 1970: broadcast of second episode of Spearhead from Space. The Doctor steals some clothes and joins up with the Brigadier and Liz. Meanwhile there are sinister goings-on at the plastics factory.
10 January 1976: broadcast of second episode of The Brain of Morbius. The Sisters threaten the Doctor, and blind Sarah; Solon wants the Doctor's head very badly, and we see the disembodied brain.
10 January 1981: broadcast of second episode of Warrior's Gate. Romana is forced into the navigator's chair, and the Doctor forced to repair the Gundan robots until he falls through a mirror.