Classic Doctor Who: The Fourth Doctor

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

Torture and death await the Doctor as the Powers of Darkness envelop the Earth.

The Doctor and his companions are trapped in the palace by members of the Cult of Demons.

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

The hand builds power and reacts to nuclear radiation, causing an overload situation.

The fossilised hand has regenerated into a Kastrian called Eldrad who appears to be female

Eldrad reconfigures his body to its male form and states he will return to Earth to rule.

The Doctor returns to Gallifrey and races to prevent a tragedy.

The Time Lord president has been assassinated and the Doctor is the prime suspect.

The Doctor enters the virtual world of the Matrix hoping to track down the Master.

The Master makes his final bid to release the devastating power of the Time Lords.

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

The Doctor tries to win the trust of the savage Sevateem tribe.

The Doctor discovers the terrible truth about Xoanon and realises that he is to blame.

The insane computer Xoanon refuses the Doctor's help and prepares to destroy the planet.

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

The Doctor and Leela are blamed for the murder of one of the sandminer's crew.

Taren Capel is using the robots to carry out the murders.

As the robots close in, the Doctor and Leela join forces with the crew to fight back.

Content shows attitudes of its time and may be offensive to some viewers. The team land in Victorian London.

Content shows attitudes of its time and may be offensive to some viewers. The team hide with Prof Litefoot.

Content shows attitudes of its time and may be offensive to some viewers. Weng-Chiang has lost a time cabinet.

Content shows attitudes of its time and may be offensive to some viewers. The Doctor confronts Li H'sen Chang.

Content shows attitudes of its time and may be offensive to some viewers. Greel finds the lost time cabinet.

Content shows attitudes of its time and may be offensive to some viewers. The House of the Dragon is found.