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
Mary Tamm
John Leeson
Beatrix Lehmann
Susan Engel
Nicholas McArdle
Elaine Ives-Cameron
Doctor Who: The Invisible Enemy
Doctor Who: Image of the Fendahl
Doctor Who: The Sun Makers
Doctor Who: Underworld
Doctor Who: The Invasion of Time
Doctor Who: The Pirate Planet
Doctor Who: Castrovalva
Doctor Who: Time-Flight
Doctor Who: Arc of Infinity
Duckweed
Doctor Who: Terminus
Doctor Who: The King's Demons
Doctor Who: Kinda
Doctor Who: Warriors of the Deep
Meet the Robinsons
Doctor Who: Full Circle
Doctor Who: State of Decay
Doctor Who: Warriors' Gate
Doctor Who: The Keeper of Traken
Doctor Who: Logopolis
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