This season introduced K9 to the series and saw the departure of Leela. It was originally intended to include Terrance Dicks' story The Vampire Mutations but, due to a major BBC production of Dracula, it was postponed. It later became Season 18's State of Decay. To replace it, Dicks quickly scripted the season opener, Horror of Fang Rock. The season took a two week transmission break over the 1977 Christmas period, between the broadcast of part four of The Sun Makers and part one of Underworld.

Season 15 Episode 1 - Horror of Fang Rock (1)

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? Air Date : 3rd-Sep-1977  Read More

Season 15 Episode 2 - Horror of Fang Rock (2)

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? Air Date : 10th-Sep-1977  Read More

Season 15 Episode 3 - Horror of Fang Rock (3)

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… Air Date : 17th-Sep-1977  Read More

Season 15 Episode 4 - Horror of Fang Rock (4)

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. Air Date : 24th-Sep-1977  Read More

Season 15 Episode 5 - The Invisible Enemy (1)

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? Air Date : 1st-Oct-1977  Read More

Season 15 Episode 6 - The Invisible Enemy (2)

Leela and Lowe take the Doctor to the Bi-Al Foundation for help. But how can they cure an infection of the mind? Air Date : 8th-Oct-1977  Read More

Season 15 Episode 7 - The Invisible Enemy (3)

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. Air Date : 15th-Oct-1977  Read More

Season 15 Episode 8 - The Invisible Enemy (4)

The Nucleus, now grown to human size, is determined to spawn and take over the Galaxy. Only the Doctor and Leela can stop it. Air Date : 22nd-Oct-1977  Read More

Season 15 Episode 9 - Image of the Fendahl (1)

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? Air Date : 29th-Oct-1977  Read More

Season 15 Episode 10 - Image of the Fendahl (2)

The mystery surrounding the strange skull deepens. Thea is slowly succumbing to its influence while the Doctor prepares to battle a creature from mythology. Air Date : 5th-Nov-1977  Read More

Season 15 Episode 11 - Image of the Fendahl (3)

While Max prepares to tap supernatural forces beyond imagining, the Doctor and Leela investigate the legend of the Fendahl. Air Date : 12th-Nov-1977  Read More

Season 15 Episode 12 - Image of the Fendahl (4)

The Fendahl is returning to life, ready to consume everything in its path. Can the Doctor find a way to kill death itself? Air Date : 19th-Nov-1977  Read More

Season 15 Episode 13 - The Sun Makers (1)

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... Air Date : 26th-Nov-1977  Read More

Season 15 Episode 14 - The Sun Makers (2)

The Doctor has been captured by the Gatherer. Leela works to free him but the Gatherer is already laying his own plans… Air Date : 3rd-Dec-1977  Read More

Season 15 Episode 15 - The Sun Makers (3)

Now Leela is the prisoner of the Collector. He knows of the Doctor and is determined to rid himself of both of them. Air Date : 10th-Dec-1977  Read More

Season 15 Episode 16 - The Sun Makers (4)

The Doctor now moves to completely overthrow the Company. But the Collector has one last trump card to play. Air Date : 17th-Dec-1977  Read More

Season 15 Episode 17 - Underworld (1)

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… Air Date : 7th-Jan-1978  Read More

Season 15 Episode 18 - Underworld (2)

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? Air Date : 14th-Jan-1978  Read More

Season 15 Episode 19 - Underworld (3)

The Minyans have, at long last, found the P7E. But a host of guards and robotic seers stand between them and the race banks. Air Date : 21st-Jan-1978  Read More

Season 15 Episode 20 - Underworld (4)

The Minyons struggle to gain the precious race banks from the Oracle. But perhaps it is giving in a little too easily ... Air Date : 28th-Jan-1978  Read More

Season 15 Episode 21 - The Invasion of Time (1)

Gallifrey, world of the Time Lords. The Doctor returns and claims the vacant presidency. But his behaviour is erratic and his motives mysterious. Air Date : 4th-Feb-1978  Read More

Season 15 Episode 22 - The Invasion of Time (2)

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. Air Date : 11th-Feb-1978  Read More

Season 15 Episode 23 - The Invasion of Time (3)

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. Air Date : 18th-Feb-1978  Read More

Season 15 Episode 24 - The Invasion of Time (4)

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? Air Date : 25th-Feb-1978  Read More

Season 15 Episode 25 - The Invasion of Time (5)

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… Air Date : 4th-Mar-1978  Read More

Season 15 Episode 26 - The Invasion of Time (6)

The Sontarans finally invade the TARDIS itself, seeking the Great Key. The Doctor, however, has other uses for this powerful object… Air Date : 11th-Mar-1978  Read More