Doctor Who: The Ribos Operation (1978)

Doctor Who: The Ribos Operation (1978) - Science Fiction Movies 100 minutes. The Ribos Operation, The Key to Time: The Ribos Operation. 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... time travel