England, the 12th century. Robber baron Irongron is recruited by Linx, a Sontaran warrior whose starship has been forced down on Earth. Linx is forced to use a time-travel device to steal resources and scientists from the future to repair his ship, but in doing so involves UNIT and the Doctor...

England, the 12th century. Robber baron Irongron is recruited by Linx, a Sontaran warrior whose starship has been forced down on Earth. Linx is forced to use a time-travel device to steal resources and scientists from the future to repair his ship, but in doing so involves UNIT and the Doctor...

England, the 12th century. Robber baron Irongron is recruited by Linx, a Sontaran warrior whose starship has been forced down on Earth. Linx is forced to use a time-travel device to steal resources and scientists from the future to repair his ship, but in doing so involves UNIT and the Doctor...

England, the 12th century. Robber baron Irongron is recruited by Linx, a Sontaran warrior whose starship has been forced down on Earth. Linx is forced to use a time-travel device to steal resources and scientists from the future to repair his ship, but in doing so involves UNIT and the Doctor...

London, the near future. The Doctor and Sarah return to a deserted city under martial law.

London, the near future. The Doctor and Sarah return to a deserted city under martial law. Dinosaurs are running amok in the streets - but how can this be happening? And who stands to gain from it?

London, the near future. The Doctor and Sarah return to a deserted city under martial law. Dinosaurs are running amok in the streets - but how can this be happening? And who stands to gain from it?

London, the near future. The Doctor and Sarah return to a deserted city under martial law. Dinosaurs are running amok in the streets - but how can this be happening? And who stands to gain from it?

London, the near future. The Doctor and Sarah return to a deserted city under martial law. Dinosaurs are running amok in the streets - but how can this be happening? And who stands to gain from it?

London, the near future. The Doctor and Sarah return to a deserted city under martial law. Dinosaurs are running amok in the streets - but how can this be happening? And who stands to gain from it?

The barren planet Exxilon, some time in the future. The TARDIS is forced down by a total power failure and the Doctor and Sarah meet a stranded Earth crew who came here to mine for priceless medical supplies. But what is causing the power failures? And why have the Daleks come here too?

The barren planet Exxilon, some time in the future. The TARDIS is forced down by a total power failure and the Doctor and Sarah meet a stranded Earth crew who came here to mine for priceless medical supplies. But what is causing the power failures? And why have the Daleks come here too?

The barren planet Exxilon, some time in the future. The TARDIS is forced down by a total power failure and the Doctor and Sarah meet a stranded Earth crew who came here to mine for priceless medical supplies. But what is causing the power failures? And why have the Daleks come here too?

The barren planet Exxilon, some time in the future. The TARDIS is forced down by a total power failure and the Doctor and Sarah meet a stranded Earth crew who came here to mine for priceless medical supplies. But what is causing the power failures? And why have the Daleks come here too?

The planet Peladon, some time in the future. The Doctor and Sarah arrive on the planet Peladon 50 years after "The Curse of Peladon" They find King Peladon's daughter, Queen Thalira has inherited the throne. The Galactic Federation is at war with Galaxy Five and needs the mineral Trisilicate in order to bring about an end to the war. It seems the Ghost of Aggedor has been sighted and is blamed for hugging of miners, which hampers the acquisition of the much needed Trisilicate.

The planet Peladon, some time in the future. The Doctor and Sarah arrive on the planet Peladon 50 years after "The Curse of Peladon" They find King Peladon's daughter, Queen Thalira has inherited the throne. The Galactic Federation is at war with Galaxy Five and needs the mineral Trisilicate in order to bring about an end to the war. It seems the Ghost of Aggedor has been sighted and is blamed for hugging of miners, which hampers the acquisition of the much needed Trisilicate.

The planet Peladon, some time in the future. The Doctor and Sarah arrive on the planet Peladon 50 years after "The Curse of Peladon" They find King Peladon's daughter, Queen Thalira has inherited the throne. The Galactic Federation is at war with Galaxy Five and needs the mineral Trisilicate in order to bring about an end to the war. It seems the Ghost of Aggedor has been sighted and is blamed for hugging of miners, which hampers the acquisition of the much needed Trisilicate.

The planet Peladon, some time in the future. The Doctor and Sarah arrive on the planet Peladon 50 years after "The Curse of Peladon" They find King Peladon's daughter, Queen Thalira has inherited the throne. The Galactic Federation is at war with Galaxy Five and needs the mineral Trisilicate in order to bring about an end to the war. It seems the Ghost of Aggedor has been sighted and is blamed for hugging of miners, which hampers the acquisition of the much needed Trisilicate.

The planet Peladon, some time in the future. The Doctor and Sarah arrive on the planet Peladon 50 years after "The Curse of Peladon" They find King Peladon's daughter, Queen Thalira has inherited the throne. The Galactic Federation is at war with Galaxy Five and needs the mineral Trisilicate in order to bring about an end to the war. It seems the Ghost of Aggedor has been sighted and is blamed for hugging of miners, which hampers the acquisition of the much needed Trisilicate.

The planet Peladon, some time in the future. The Doctor and Sarah arrive on the planet Peladon 50 years after "The Curse of Peladon" They find King Peladon's daughter, Queen Thalira has inherited the throne. The Galactic Federation is at war with Galaxy Five and needs the mineral Trisilicate in order to bring about an end to the war. It seems the Ghost of Aggedor has been sighted and is blamed for hugging of miners, which hampers the acquisition of the much needed Trisilicate.

England, the near future. Mike Yates, formerly of UNIT, is disturbed by odd happenings at a monastic retreat. Using Sarah as a liaison, he is able to warn the Doctor and the Brigadier. But how is the Doctor's research into ESP and the blue Metebelius III crystal connected to Mike's warning?

A highly intelligent spider from Metebelius III arrives on Earth in search of the powerful crystal. When it is stolen from his laboratory, the Doctor leads the chase over land, water and air to recover it.

England, the near future. As the Doctor receives a parcel from South America, Mike Yates asks Sarah to visit the meditation centre where he's been recuperating. But what is the true significance of the blue crystal of Metebelis Three? And is this adventure one too many for the Doctor?

England, the near future. As the Doctor receives a parcel from South America, Mike Yates asks Sarah to visit the meditation centre where he's been recuperating. But what is the true significance of the blue crystal of Metebelis Three? And is this adventure one too many for the Doctor?

England, the near future. As the Doctor receives a parcel from South America, Mike Yates asks Sarah to visit the meditation centre where he's been recuperating. But what is the true significance of the blue crystal of Metebelis Three? And is this adventure one too many for the Doctor?

England, the near future. As the Doctor receives a parcel from South America, Mike Yates asks Sarah to visit the meditation centre where he's been recuperating. But what is the true significance of the blue crystal of Metebelis Three? And is this adventure one too many for the Doctor?