Doctor Who - The Key to Time

This season saw the introduction of the Black and White Guardians as well as the companion Romana, who became only the second female Time Lord companion since Susan. This season is sometimes colloquially known as The Key to Time season after the story arc involving the Key to Time. Although not the first season to consist of linked stories (Season 8 in 1971 was the first, as all the stories that year featured the Master), it was the first to be recognised as having a series long arc. Although multi serial arcs would occur again, such a full- season experiment wouldn't be attempted again until Season 23. The arc has a number of similarities to the Season 1 story The Keys of Marinus. The storyline was originally proposed for Season 15, but it required more planning.

26 Episodes

The Ribos Operation (1)

Season 16 - Episode 1

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 Ribos Operation (2)

Season 16 - Episode 2

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 Gr...

The Ribos Operation (3)

Season 16 - Episode 3

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 t...

The Ribos Operation (4)

Season 16 - Episode 4

Trapped in the catacombs between a mad warlord and ravenous monsters, the Doctor and Romana work desperately to obtain the segment of the Ke...

The Pirate Planet (1)

Season 16 - Episode 5

Planet Zanak, unknown time. The Doctor and Romana are seeking the planet Calufrax where the second segment waits. They are in the right plac...

The Pirate Planet (2)

Season 16 - Episode 6

The Doctor begins to investigate the mysteriously wealthy planet Zanak. Mentiads, a deranged Captain, strange omens, miraculous mines – what...

The Pirate Planet (3)

Season 16 - Episode 7

The Mentiads take the Doctor, Romana and Kimus to a reunion with K9 and Mula, where they set about trying to defeat the Captain.

The Pirate Planet (4)

Season 16 - Episode 8

The Captain and Xanxia work toward their secret goals. Both depends on the pirate planet consuming one more victim - Earth.

The Stones of Blood (1)

Season 16 - Episode 9

England, the late 1970s. The Doctor and Romana arrive in search of the third segment. But the Tracer readings are erratic and something omin...

The Stones of Blood (2)

Season 16 - Episode 10

The quest for the Third Segment has landed the Doctor and Romana in the midst of a druidic cult centred on a stone circle. But the stones ar...

The Stones of Blood (3)

Season 16 - Episode 11

Chased by blood-thirsty stones, the Doctor must find a way to rescue Romana. What awaits him in the theoretical absurdity of hyperspace?

The Stones of Blood (4)

Season 16 - Episode 12

Facing a sentence of death from merciless justice machines, the Doctor must play for time while Romana tries to discover just who Vivian Fey...

The Androids of Tara (1)

Season 16 - Episode 13

Arriving on Tara, Romana locates the fourth segment of the Key to Time with ease. But getting it away proves more difficult, as she is captu...

The Androids of Tara (2)

Season 16 - Episode 14

The Doctor must employ a desperate gambit to keep the evil Grendel off the throne. And the Count has a new pawn to play - Romana.

The Androids of Tara (3)

Season 16 - Episode 15

The battle for control of Tara turns into a duel of wits between the Doctor and Grendel. But the Count shows he has more treacherous tricks ...

The Androids of Tara (4)

Season 16 - Episode 16

Grendel plans two weddings and a funeral to cement his hold over Tara. The Doctor and K-9 race to foil him and save the Time Lady's life.

The Power of Kroll (1)

Season 16 - Episode 17

The Third Moon of Delta Magna, The Future. The Doctor and Romana arrive in search of the fifth segment and are immediately swept up in a con...

The Power of Kroll (2)

Season 16 - Episode 18

The Doctor and Romana try to avoid being sacrificed to Kroll – just in time for the real monster to appear.

The Power of Kroll (3)

Season 16 - Episode 19

The massive Kroll is awake and killing anyone in its path. And the swampies are determined to appease it – by sacrificing the Doctor and Rom...

The Power of Kroll (4)

Season 16 - Episode 20

The Doctor and Romana are trapped between the monstrous Kroll and the insane refinery commander. And there is no sign of the fifth segment o...

The Armageddon Factor (1)

Season 16 - Episode 21

Searching for the sixth segment, the Doctor and Romana land in the midst of a brutal nuclear war between the planets Atrios and Zeos.

The Armageddon Factor (2)

Season 16 - Episode 22

Swept up in an apocalyptic war, the Doctor must help the Marshal defend his planet. But who or what controls the Marshal?

The Armageddon Factor (3)

Season 16 - Episode 23

The Doctor meets a new enemy – the Shadow – who wants the Key to Time. And the Atrian-Zeon war is approaching an awful climax.

The Armageddon Factor (4)

Season 16 - Episode 24

The Doctor is forced into a desperate gambit to prevent a massacre. But it is getting harder to tell friend from foe.

The Armageddon Factor (5)

Season 16 - Episode 25

The Doctor and Romana finally venture into the Shadow's lair. The Shadow appears to hold all the cards but the Doctor has found an old frien...

The Armageddon Factor (6)

Season 16 - Episode 26

The Doctor and the Shadow have their final confrontation to take control of the Key to Time. Completing it may entail an awful sacrifice. An...