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.
Tom Baker
The Doctor
Mary Tamm
Romana
John Leeson
K-9 (voice)
Beatrix Lehmann
Professor Rumford
Susan Engel
Vivien Fay
Nicholas McArdle
De Vries
Elaine Ives-Cameron
Martha
