The Doctor is summoned by the mysterious and powerful White Guardian, and sent on a quest to find the six segments of the Key to Time, which, once assembled, will restore balance to the Universe. Joining the Doctor and K9 is the smart and sassy Romana, a Time Lord fresh from the Academy. Landing on the wintry planet of Ribos to locate the first segment, the TARDIS crew quickly find themselves embroiled in a little local trouble with a pair of conmen and an unstable warlord...
Tom Baker
as The Doctor
Mary Tamm
as Romana
John Leeson
as K-9 (voice)
Cyril Luckham
as The Guardian
Iain Cuthbertson
as Garron
Nigel Plaskitt
as Unstoffe
Paul Seed
as Graff Vynda-K
Robert Keegan
as Sholakh
Timothy Bateson
as Binro
Anne Tirard
as The Seeker
Prentis Hancock
as Shrieve Captain
