The Fourth Doctor

Doctor number four donned his scarf, left planet Earth and returned to space.

UNIT are called in when top secret plans are stolen from high security establishments.

The survivors of Earth lie in hibernation but the Doctor finds there has been an intruder.

Arriving on Earth, the Doctor, Harry and Sarah meet a group of stranded human colonists.

The Time Lords send the Doctor to Skaro shortly before the creation of the Daleks.

There the crew of Nerva have fallen victim to a space plague.

The Doctor returns to discover what is destroying oil rigs off the coast of Scotland.

The TARDIS takes the Doctor and Sarah to Zeta Minor on the edge of the universe.

The Doctor and Sarah discover that an ancient and powerful evil is manifesting on Earth.

On Earth, all is not as it seems as the Doctor and Sarah discover the dead are walking.

The Doctor and Sarah take shelter in the castle of Dr Solon on the planet Karn.

The Doctor and Sarah investigate two alien seed pods discovered in Antarctica.

The TARDIS flies into the Mandragora Helix, an alien energy in space.

Sarah finds a mysterious fossilised hand, which re-grows and begins to move.

The Doctor returns to Gallifreyand races to prevent a tragedy.

The Doctor arrives on an alien world and is accused of being 'the evil one'.

The TARDIS takes the Doctor and Leela to a huge, mobile sand mine on an alien world.

The Doctor and Leela arrive in Victorian London where many young women have disappeared.

The Doctor and Leela are on Fang Rock island where a murderous creature is at large.

The Doctor is infected by an alien virus and becomes possessed by the will of the Nucleus.

At Fetch Priory a mysterious skull is exerting a dangerous influence on those around it.

The TARDIS arrives on a dystopian Pluto where a large company exploits it's workers.

The Doctor encounters the survivors of Minyos, who are searching for a lost spacecraft.

The Doctor returns to Gallifrey to claim his position as President of the Time Lords.

The Guardian of Time gives the Doctor a difficult task - and a new assistant.

The Doctor faces new dangers when searching for the second segment to the Key of Time.

The Doctor's search for the third segment of the Key to Time takes him to a stone circle.

Arriving on Tara, Romana is taken prisoner by the scheming Count Grendel.

On the third moon of Delta Magna, the Doctor and Romana are soon caught up in a conflict.

The Doctor and Romana arrive on the war-torn planet of Atrios.

The Doctor and Romana arrive on a desolate planet, but soon find that they aren't alone.

While holidaying in Paris, the Doctor and Romana experience cracks in the fabric of time.

The Doctor and Romana follow a distress signal to the jungle world of Chloris.

A hyperspace accident results in two ships fusing together and releasing a deadly menace.

With the TARDIS disabled, the Doctor is powerless to act when Romana is kidnapped.

The Doctor and Romana fight to stop the evil alien Skagra.

The Doctor and Romana visit the Leisure Hive, a tourist attraction on the planet Argolis.

Meglos plans to steal the ancient and powerful Dodecahedron from Tigella.

What has become of Gallifrey? Who are the marauding Outlers. What lurks beneath the marsh?

The TARDIS lands on a world where the inhabitants live in fear of the Three Who Rule.

The TARDIS is drawn into an empty void, but they are not the only ones trapped there.

The Keeper of Traken appears in the TARDIS seeking the Doctor's help.

To repair the TARDIS's chameleon circuit, the Doctor goes to Earth for a real police box.