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...
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| Writing | Robert Holmes | Writer |
| Directing | George Spenton-Foster | Director |
| Production | Graham Williams | Producer |
| Writing | Anthony Read | Script Editor |
| Sound | Dudley Simpson | Original Music Composer |
