Episode 1
Aired Sep 2, 1978
The Ribos Operation
The Doctor and Romana set out to collect the six segments of the "Key to Time." Their first stop: Ribos, a planet where the inhabitants have reached a Middle Ages stage of development.
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Episode 2
Aired Sep 9, 1978
The Ribos Operation
The Doctor finds the first segment, but he and Romana are threatened by trickery.
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Episode 3
Aired Sep 16, 1978
The Ribos Operation
The Doctor, Romana and K9 are caught between deadly weapons and savage beasts.
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Episode 4
Aired Sep 23, 1978
The Ribos Operation
The Doctor and Romana are trapped in the catacombs, hunted by both Vynda-K's men and the Ribans.
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Episode 5
Aired Sep 30, 1978
The Pirate Planet
The Doctor and his companions land on the planet Calufrax but they discover another planet, Zanak, is in its place.
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Episode 6
Aired Oct 7, 1978
The Pirate Planet
The Doctor's efforts to rescue Romana lead him to a startling discovery.
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Episode 7
Aired Oct 14, 1978
The Pirate Planet
The Doctor enlists the aid of the powerful Mentiads in attacking the Captain.
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Episode 8
Aired Oct 21, 1978
The Pirate Planet
The Doctor's only hope in vanquishing the Captain and Queen Xanxia involves risking the destruction of the Tardis.
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Episode 9
Aired Oct 28, 1978
The Stones of Blood
The TARDIS materializes on Earth.
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Episode 10
Aired Nov 4, 1978
The Stones of Blood
The Doctor and Romana encounter strange monsters as they explore the connection between the stone circle and the missing Key segment.
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Episode 11
Aired Nov 11, 1978
The Stones of Blood
The Doctor unmasks the villain, but he and Romana may be trapped forever in another dimension.
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Episode 12
Aired Nov 18, 1978
The Stones of Blood
The Doctor's only hope is to turn the adversity at hand to his advantage.
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Episode 13
Aired Nov 25, 1978
The Androids of Tara
The Doctor becomes involved in identity problems while trying to get away with the fourth segment of the Key to Time.
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Episode 14
Aired Dec 2, 1978
The Androids of Tara
The evil Count Grendel holds Romana, the Princess and the Prince hostage as part of his plan to usurp the throne of Tara.
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Episode 15
Aired Dec 9, 1978
The Androids of Tara
The Doctor and Grendel engage in a duel of wits with a kingdom hanging in the balance.
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Episode 16
Aired Dec 16, 1978
The Androids of Tara
Only a last-minute rescue can save Romana, the fourth segment and the kingdom from Grendel's infamy.
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Episode 17
Aired Dec 23, 1978
The Power of Kroll
The hunt for the fifth segment of the Key to Time embroils the Doctor in gunrunning with primitive swamp dwellers.
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Episode 18
Aired Dec 30, 1978
The Power of Kroll
The Doctor and his companions are caught between Swampies and technicians as the monster Kroll awakes.
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Episode 19
Aired Jan 6, 1979
The Power of Kroll
The Swampies decide that Kroll must be appeased with human sacrifice, and guess who they select as the victims.
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Episode 20
Aired Jan 13, 1979
The Power of Kroll
Kroll embarks on a rampage and Thrawns efforts to defeat the monster only make things worse.
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Episode 21
Aired Jan 20, 1979
The Armageddon Factor
The Doctor begins a perilous mission to save all humankind from destruction.
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Episode 22
Aired Jan 27, 1979
The Armageddon Factor
The Doctor and his companions are trapped on Zeos, which has been programmed to self-destruct.
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Episode 23
Aired Feb 3, 1979
The Armageddon Factor
The Doctor discovers the bizarre truth about the Zeons.
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Episode 24
Aired Feb 10, 1979
The Armageddon Factor
Armageddon approaches as nothing seems to stand in the way of the Shadow's dark purpose.
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Episode 25
Aired Feb 17, 1979
The Armageddon Factor
The Doctor visits the Shadow's lair.
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Episode 26
Aired Feb 24, 1979
The Armageddon Factor
The truth about the sixth segment is discovered, but Armageddon is only seconds away.
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