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TV Shows
Doctor Who
Season 15
Episode 5

The Invisible Enemy (1)

October 1, 1977

62.0%

Deep space, 5000AD. An Earth supply shuttle is infected by a strange sentient space-borne virus, which quickly spreads to the crew of the refuelling station on the moon Titan. Even worse, the Doctor himself falls victim. But why is Leela immune, and what is the virus's ultimate goal?

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Doctor Who: Season 15 - 26 Episode s

15x1 - Horror of Fang Rock (1)
September 3, 1977
The English channel, the 1900s AD. The TARDIS lands on barren Fang Rock, inhabited until now only by three lighthouse keepers. But what is the strange fog covering the island, and can it be connected to the falling star sighted earlier that night?
15x2 - Horror of Fang Rock (2)
September 10, 1977
The survivors of a wrecked ship are stranded with the lighhouse crew on Fang Rock as a deadly menace slithers through the fog. Has the Beast of Fang Rock returned?
15x3 - Horror of Fang Rock (3)
September 17, 1977
The Doctor barricades everyone in the lighthouse to protect them from the mysterious deadly creature in the fog. But it may already be inside, biding its time…
15x4 - Horror of Fang Rock (4)
September 24, 1977
The Rutan starts picking off the surviving humans one by one as the Doctor and Leela struggle to defeat not only the alien but an entire fleet waiting to occupy Earth.
15x5 - The Invisible Enemy (1)
October 1, 1977
Deep space, 5000AD. An Earth supply shuttle is infected by a strange sentient space-borne virus, which quickly spreads to the crew of the refuelling station on the moon Titan. Even worse, the Doctor himself falls victim. But why is Leela immune, and what is the virus's ultimate goal?
15x6 - The Invisible Enemy (2)
October 8, 1977
Leela and Lowe take the Doctor to the Bi-Al Foundation for help. But how can they cure an infection of the mind?
15x7 - The Invisible Enemy (3)
October 15, 1977
Miniaturised clones of the Doctor and Leela are injected into his brain. But they must now fight the virus on its own level. And its servants are closing in around them.
15x8 - The Invisible Enemy (4)
October 22, 1977
The Nucleus, now grown to human size, is determined to spawn and take over the Galaxy. Only the Doctor and Leela can stop it.
15x9 - Image of the Fendahl (1)
October 29, 1977
England, the late 1970s. At Fetch Priory, Dr Fendelman's experiments with the new Time Scanner are disrupted by the mysterious death of a hiker, nearby. Then there's the mysterious skull, also being used as part of his work. A skull that seems to predate the evolution of mankind. What is the true role of the Fendahl in humanity's evolution?
15x10 - Image of the Fendahl (2)
November 5, 1977
The mystery surrounding the strange skull deepens. Thea is slowly succumbing to its influence while the Doctor prepares to battle a creature from mythology.
15x11 - Image of the Fendahl (3)
November 12, 1977
While Max prepares to tap supernatural forces beyond imagining, the Doctor and Leela investigate the legend of the Fendahl.
15x12 - Image of the Fendahl (4)
November 19, 1977
The Fendahl is returning to life, ready to consume everything in its path. Can the Doctor find a way to kill death itself?
15x13 - The Sun Makers (1)
November 26, 1977
Pluto, the distant future. The planet has been terraformed and is now orbited by artificial suns, provided by the rapacious company who ruthlessly exploit the relocated human workforce. The Doctor, Leela, and K9 arrive and befriend a luckless drone worker, but they must flee with him to the dark undercity...
15x14 - The Sun Makers (2)
December 3, 1977
The Doctor has been captured by the Gatherer. Leela works to free him but the Gatherer is already laying his own plans…
15x15 - The Sun Makers (3)
December 10, 1977
Now Leela is the prisoner of the Collector. He knows of the Doctor and is determined to rid himself of both of them.
15x16 - The Sun Makers (4)
December 17, 1977
The Doctor now moves to completely overthrow the Company. But the Collector has one last trump card to play.
15x17 - Underworld (1)
January 7, 1978
Deep space, an unknown time. The Doctor encounters the Minyans, survivors of a race the Time Lords unwittingly obliterated early in their own history. The Minyans are searching for their race's lost gene banks, a quest which takes them to the edge of the galaxy…
15x18 - Underworld (2)
January 14, 1978
After 100,000 years, the Minyans have found the long-lost P7E. But what awaits them on the ship, long buried in the core of a newborn planet?
15x19 - Underworld (3)
January 21, 1978
The Minyans have, at long last, found the P7E. But a host of guards and robotic seers stand between them and the race banks.
15x20 - Underworld (4)
January 28, 1978
The Minyons struggle to gain the precious race banks from the Oracle. But perhaps it is giving in a little too easily ...
15x21 - The Invasion of Time (1)
February 4, 1978
Gallifrey, world of the Time Lords. The Doctor returns and claims the vacant presidency. But his behaviour is erratic and his motives mysterious.
15x22 - The Invasion of Time (2)
February 11, 1978
The Doctor is made president of the Time Lords. He immediately orders K-9 to lower the planet's defences and has Leela banished to the wilderness.
15x23 - The Invasion of Time (3)
February 18, 1978
The Doctor has betrayed his own people and enabled a Vardan invasion of Gallifrey. Leela joins forces with the Outsiders and prepares to strike back against the aliens.
15x24 - The Invasion of Time (4)
February 25, 1978
The Doctor works to free his planet of the Vardan menace. How can he defeat an enemy who can read his very thoughts? And does their invasion conceal a greater menace?
15x25 - The Invasion of Time (5)
March 4, 1978
The Sontarans have invaded Gallifrey, seeking to seize the incredible power of the Time Lords. The Doctor's first step is to cut them off from their fleet. But Kelner is helping the enemy…
15x26 - The Invasion of Time (6)
March 11, 1978
The Sontarans finally invade the TARDIS itself, seeking the Great Key. The Doctor, however, has other uses for this powerful object…

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15x1 - Horror of Fang Rock (1)

15x2 - Horror of Fang Rock (2)

15x3 - Horror of Fang Rock (3)

15x4 - Horror of Fang Rock (4)

15x5 - The Invisible Enemy (1)

15x6 - The Invisible Enemy (2)

15x7 - The Invisible Enemy (3)

15x8 - The Invisible Enemy (4)

15x9 - Image of the Fendahl (1)

15x10 - Image of the Fendahl (2)

15x11 - Image of the Fendahl (3)

15x12 - Image of the Fendahl (4)

15x13 - The Sun Makers (1)

15x14 - The Sun Makers (2)

15x15 - The Sun Makers (3)

15x16 - The Sun Makers (4)

15x17 - Underworld (1)

15x18 - Underworld (2)

15x19 - Underworld (3)

15x20 - Underworld (4)

15x21 - The Invasion of Time (1)

15x22 - The Invasion of Time (2)

15x23 - The Invasion of Time (3)

15x24 - The Invasion of Time (4)

15x25 - The Invasion of Time (5)

15x26 - The Invasion of Time (6)

S0: Specials

S1: Season 1

S2: Season 2

S3: Season 3

S4: Season 4

S5: Season 5

S6: Season 6

S7: Season 7

S8: Season 8

S9: Season 9

S10: Season 10

S11: Season 11

S12: Season 12

S13: Season 13

S14: Season 14

S15: Season 15

S16: The Key to Time

S17: Season 17

S18: Season 18

S19: Season 19

S20: Season 20

S21: Season 21

S22: Season 22

S23: The Trial of a Time Lord

S24: Season 24

S25: Season 25

S26: Season 26