Searching for the third segment to the Key to Time brings the Doctor and Romana to present-day Earth, where the travellers have to contend with stone circles, Druidic rituals and a not-so-mythical goddess known as the Cailleach.
1978-11-18
2004-01-17
2006-06-16
1980-11-15
1980-12-13
1981-02-21
1981-03-21
1992-11-02
2008-05-31
2009-04-24
1982-03-24
2000-01-25
1978-02-01
1990-06-28
1979-10-24
2010-04-08
2012-05-23
2020-02-27
2020-08-06
2005-08-20
1996-05-12