England, the late 1970s. The Doctor and Romana arrive in search of the third segment. But the Tracer readings are erratic and something ominous is happening with an ancient stone circle...
- Directed by
- Darrol Blake
- Written by
- David Fisher
Guest stars
All episodes — The Key to Time
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S16 E1The Ribos Operation (1)
Sep 2, 19786.725 min
The Magellanic Clouds, the planet Ribos, an unknown time. Ordered by the White Guardian to collect the pieces of the omnipotent Key to Time, The Doctor, K-9 and his new assistant Romana arrive. Collecting the first segment is not going to b
S16 E2The Ribos Operation (2)
Sep 9, 19786.625 min
Trying to obtain the first segment of the Key to Time, the Doctor and Romana are swept up in an elaborate con. The target – the homicidal Graff Vynda K.
S16 E3The Ribos Operation (3)
Sep 16, 19786.625 min
Prisoners of the maniacal Graff Vynda K, the Doctor and Romana must break out and pursue the first segment – even as Unstoff takes it into the most dangerous place on Ribos.
S16 E4The Ribos Operation (4)
Sep 23, 19786.625 min
Trapped in the catacombs between a mad warlord and ravenous monsters, the Doctor and Romana work desperately to obtain the segment of the Key to Time - and escape alive.
S16 E5The Pirate Planet (1)
Sep 30, 19787.425 min
Planet Zanak, unknown time. The Doctor and Romana are seeking the planet Calufrax where the second segment waits. They are in the right place and the right time… but on the wrong planet.
S16 E6The Pirate Planet (2)
Oct 7, 19787.725 min
The Doctor begins to investigate the mysteriously wealthy planet Zanak. Mentiads, a deranged Captain, strange omens, miraculous mines – what does it all mean? And what does it have to do with the Key to Time?