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Episodes
- S16 E1 - The Ribos Operation: Part 1September 1, 197825minOn a mission to collect the six segments of the Key to Time, the Doctor and Romana travel to the planet Ribos where the first segment is protected by the monstrous Shrivenzale.Free trial of BritBox
- S16 E2 - The Ribos Operation: Part 2September 8, 197825minGarron is attempting to trick the Graff Vynda-K into buying the planet Ribos, but the jethrik that is vital to his plan is really the first segment of the Key to Time.Free trial of BritBox
- S16 E3 - The Ribos Operation: Part 3September 15, 197825minThe Doctor and Romana's search for the first segment of the Key to Time is hampered when the Graff Vynda-K takes them prisoner.Free trial of BritBox
- S16 E4 - The Ribos Operation: Part 4September 22, 197825minPursued into the catacombs by the Graff and attacked by the ferocious Shrivenzale, the Doctor and Romana struggle to stay alive and find the first segment of the Key to Time.Free trial of BritBox
- S16 E5 - The Pirate Planet: Part 1September 29, 197825minIn search of the second segment of the Key to Time, the Doctor and Romana travel to the planet Calufrax. But they find that a completely different planet has taken its place.Free trial of BritBox
- S16 E6 - The Pirate Planet: Part 2October 6, 197826minStill in search of the missing planet, Calufrax, the Doctor and Romana encounter the telepathic Mentiads and Zanak's ruler, the half man, half robot Captain.Free trial of BritBox
- S16 E7 - The Pirate Planet: Part 3October 13, 197826minThe Doctor has discovered the sinister truth about Zanak and solved the mystery of the missing planet. On the Bridge, the Doctor meets the real ruler of Zanak.Free trial of BritBox
- S16 E8 - The Pirate Planet: Part 4October 20, 197825minThe Doctor and Romana join forces with the Mentiads to prevent the Captain and Xanxia from using Zanak to consume the Earth.Free trial of BritBox
- S16 E9 - The Stones of Blood: Part 1October 27, 197824minThe Doctor and Romana track the third segment of the Key to Time to the vicinity of an ancient stone circle on Earth. But sinister forces are at work and the stones hide a secret.Free trial of BritBox
- S16 E10 - The Stones of Blood: Part 2November 3, 197824minThe leaders of a druidic cult have been killed and it seems that the stones from the stone circle are alive and have a taste for human blood.Free trial of BritBox
- S16 E11 - The Stones of Blood: Part 3November 10, 197824minAs the blood hungry Ogri close in, the Doctor launches a desperate attempt to rescue Romana from hyperspace.Free trial of BritBox
- S16 E12 - The Stones of Blood: Part 4November 17, 197823minThe Doctor releases two alien justice machines from imprisonment who sentenc him to death. Meanwhile Romana urgently searches for clues that will reveal Vivien Fay's true identity.Free trial of BritBox
- S16 E13 - The Androids of Tara: Part 1November 24, 197825minArriving on Tara, Romana locates the fourth segment of the Key to Time with ease, but is captured by the scheming Count Grendel who wants the throne of Tara for himself.Free trial of BritBox
- S16 E14 - The Androids of Tara: Part 2December 1, 197824minGrendel kidnaps Prince Reynart and seems set to be chosen as Tara's monarch when Reynart fails to arrive at his coronation. But the Doctor has a plan to scupper the Count's scheme.Free trial of BritBox
- S16 E15 - The Androids of Tara: Part 3December 8, 197824minWhile Romana makes her escape from the castle, the Doctor is lured to a meeting with an android duplicate of her that is programmed to kill him.Free trial of BritBox
- S16 E16 - The Androids of Tara: Part 4December 15, 197825minThe Doctor attempts to gain entry to the castle to prevent the marriage of Romana to Prince Reynart and thwart Grendal's plans to rule Tara.Free trial of BritBox
- S16 E17 - The Power of Kroll: Part 1December 22, 197823minTracing the fifth segment of the Key to Time to the third moon of Delta Magna, the Doctor and Romana are soon caught up in the conflict between humans and the Swampies.Free trial of BritBox
- S16 E18 - The Power of Kroll: Part 2December 29, 197824minThe Doctor arrives in time to save Romana from being sacrificed to the bogus god, Kroll. But it's not long before the very real Kroll makes its terrifying appearance.Free trial of BritBox
- S16 E19 - The Power of Kroll: Part 3January 5, 197922minWith the giant, squid-like Kroll awake and angry, the Swampies are eager to appease their god by using the Doctor and Romana as sacrificial victims.Free trial of BritBox
- S16 E20 - The Power of Kroll: Part 4January 12, 197922minWith Kroll on the rampage, the Doctor and Romana are appalled to discover that Thawn intends to fire a rocket at the creature which will also kill the Swampies.Free trial of BritBox
- S16 E21 - The Armageddon Factor: Part 1January 19, 197925minLooking for the final segment of the Key to Time, the Doctor and Romana arrive on the planet Atrios which is at war with the neighbouring world of Zeos.Free trial of BritBox
- S16 E22 - The Armageddon Factor: Part 2January 26, 197924minThe Marshal demands that the Doctor devise the ultimate deterrent against the attacking Zeons. But the Doctor and Romana begin to suspect that the Marshal is being manipulated.Free trial of BritBox
- S16 E23 - The Armageddon Factor: Part 3February 2, 197925minJourneying to Zeos by transmat, the Doctor finds that it is an empty world. As the Marshal prepares to launch his final attack, the Doctor meets the commander of Zeos's forces.Free trial of BritBox
- S16 E24 - The Armageddon Factor: Part 4February 9, 197925minWith the Marshal poised to fire upon Zeos and the Mentalis computer on a countdown to destruction, the Doctor resorts to desperate measures to prevent a cataclysm.Free trial of BritBox
- S16 E25 - The Armageddon Factor: Part 5February 16, 197925minThe Doctor and Romana arrive in the lair of the Shadow, servant of the Black Guardian who also seeks the Key to Time.Free trial of BritBox
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