Dr Who: The Ribos Operation

The Doctor and K9 Mark II are sent on a mission by the immensely powerful White Guardian. The six segments of the Key to Time, currently disguised and scattered throughout the cosmos, need to be brought together. Once assembled, the Key will allow the Guardian to restore balance and good to a universe that is decending into evil and chaos. It will also thwart the plans of the fearsome Black Guardian!. As of accepting such a daunting task wasn't enough, the Guardian appoints a new young assistant for the Doctor, Romanadvoratrelundar - Romana for short. Fresh out of the Time Lord Academy, the 140-year old Romana is confident that their mission will be easy and, if the Doctor can curb his irrational behaviour, can be rapidly completed. Using a special Tracer, the TARDIS locates the first segment on the feudal planet Ribos, where two inter-galactic criminals are using a lump of Jethryk as bait in a plot to trick a visiting nobleman into buying the planet- which is not theirs to sell. The Doctor finds himself drawn into the con-men's fiendish plan while Romana has to confront the monstrous Shrievenzale... Transmission date: 2nd September 1978 to 23rd September 1978 © BBC