Season 13

(4 episodes)

Returning to Earth, the Doctor, Sarah and Harry arrive in the Scottish Highlands to investigate the mysterious destruction of several oil rigs in the North Sea. Local superstition speaks of a deadly threat that lurks in the mists on Tulloch Moor, but the truth is even more disturbing: the legendary Loch Ness Monster is a terrifying cyborg beast which is controlled by the Zygons, an advanced alien race who are desperate to ensure their own survival, at any cost...

Written by Robert Banks Stewart

(4 episodes)

The Doctor and Sarah answer an intergalactic distress call that takes them to a far-flung planet at the edge of the known universe, Zeta Minor. Arriving at the same time as a rescue team, they search for survivors of an earlier expedition. But will anyone be allowed to leave the planet alive....?

Written by Louis Marks

(4 episodes)

When the TARDIS is infiltrated by a mysterious force, the Doctor and Sarah Jane are drawn off course and arrive in England at the turn of the 20th Century. Dark forces from aeons ago are beginning to stir, and the whole future of life on Earth is at stake. Sutekh, last of the Osirans, is breaking free from his ancient prison, and no power in the universe can stand in his way...

Written by Stephen Harris (Robert Holmes and Lewis Griefer)

(4 episodes)

When the TARDIS lands in the beautiful English village of Devesham, Sarah thinks the Doctor has finally got her back home. But all is not as it seems. Why is the village deserted? A series of baffling clues lead to local Space Defence Station, where something hideous watches and waits...

Written by Terry Nation

(4 episodes)

The Time Lords have taken control of the TARDIS, sending the Doctor and Sarah Jane Smith into dangerous territory... On the graveyard planet of Karn, the eternal Sisterhood fights to keep the sacred flame alive. High in the castle, the brilliant surgeon Mehendri Solon conducts gruesome experiments on living flesh. And as a storm approaches, evil from the depths of Time Lord history plots its return to the land of the living. But is even the Doctor's mind a match for the Brain of Morbius?

Written by Robin Bland (Terrance Dicks and Robert Holmes)

(6 episodes)

When scientists unearth two seed pods deep in the Arctic permafrost, the Doctor and Sarah Jane rush to investigate. Soon the Doctor's worst fears are confirmed: the pods house Krynoids, one of the most parasitic and dangerous life forms in the universe. One of the creatures has already infected a scientist and now a hideous monster is rampaging through the base, intent on total destruction. When the second pod is stolen amidst the escalating carnage, it is transported into the hands of insane botanist Harrison Chase. Both the ruthless millionaire and the rapidly growing carnivorous Krynoid are intent on infecting and destroying our entire world...

Written by Robert Banks Stuart