England, the near future. Exiled to the 20th century by the Time Lords, the newly-regenerated Doctor is immediately caught up in UNIT's investigation of anomalous meteorite showers. What dark secret does the local plastics factory hold?

England, the near future. Exiled to the 20th century by the Time Lords, the newly-regenerated Doctor is immediately caught up in UNIT's investigation of anomalous meteorite showers. What dark secret does the local plastics factory hold?

England, the near future. Exiled to the 20th century by the Time Lords, the newly-regenerated Doctor is immediately caught up in UNIT's investigation of anomalous meteorite showers. What dark secret does the local plastics factory hold?

England, the near future. Exiled to the 20th century by the Time Lords, the newly-regenerated Doctor is immediately caught up in UNIT's investigation of anomalous meteorite showers. What dark secret does the local plastics factory hold?

England, the near future. Wenley Moor research station is experiencing strange power losses, and off-duty staff have been killed while potholing in the local caves. What ancient force has the station reactor re-energised? And is Man's civilisation really the only one in Earth's history?

England, the near future. Wenley Moor research station is experiencing strange power losses, and off-duty staff have been killed while potholing in the local caves. What ancient force has the station reactor re-energised? And is Man's civilisation really the only one in Earth's history?

England, the near future. Wenley Moor research station is experiencing strange power losses, and off-duty staff have been killed while potholing in the local caves. What ancient force has the station reactor re-energised? And is Man's civilisation really the only one in Earth's history?

England, the near future. Wenley Moor research station is experiencing strange power losses, and off-duty staff have been killed while potholing in the local caves. What ancient force has the station reactor re-energised? And is Man's civilisation really the only one in Earth's history?

England, the near future. Wenley Moor research station is experiencing strange power losses, and off-duty staff have been killed while potholing in the local caves. What ancient force has the station reactor re-energised? And is Man's civilisation really the only one in Earth's history?

England, the near future. Wenley Moor research station is experiencing strange power losses, and off-duty staff have been killed while potholing in the local caves. What ancient force has the station reactor re-energised? And is Man's civilisation really the only one in Earth's history?

England, the near future. Wenley Moor research station is experiencing strange power losses, and off-duty staff have been killed while potholing in the local caves. What ancient force has the station reactor re-energised? And is Man's civilisation really the only one in Earth's history?

England, the near future. The UK space programme is in crisis as all contact has been lost with Mars Probe Seven. As the spacecraft returns to Earth, are the astronauts all that they appear to be...?

England, the near future. The UK space programme is in crisis as all contact has been lost with Mars Probe Seven. As the spacecraft returns to Earth, are the astronauts all that they appear to be...?

England, the near future. The UK space programme is in crisis as all contact has been lost with Mars Probe Seven. As the spacecraft returns to Earth, are the astronauts all that they appear to be...?

England, the near future. The UK space programme is in crisis as all contact has been lost with Mars Probe Seven. As the spacecraft returns to Earth, are the astronauts all that they appear to be...?

England, the near future. The UK space programme is in crisis as all contact has been lost with Mars Probe Seven. As the spacecraft returns to Earth, are the astronauts all that they appear to be...?

England, the near future. The UK space programme is in crisis as all contact has been lost with Mars Probe Seven. As the spacecraft returns to Earth, are the astronauts all that they appear to be...?

England, the near future. The UK space programme is in crisis as all contact has been lost with Mars Probe Seven. As the spacecraft returns to Earth, are the astronauts all that they appear to be...?

England, the near future. UNIT is providing security and scientific support for the Stahlman project, an attempt to tap the Earth's core for energy. But things are already going wrong…

Strange deaths, men changing into monsters, hot green slime pouring out of the waste pipes – but Professor Stahlman is determined to press ahead with the Inferno project no matter what the cost!

The Doctor has vanished from the Inferno project… or has he? He finds himself in the same place, but everyone has changed… and the drilling is closer to its deadly conclusion.

In a parallel England, the Doctor tries desperately to convince his captors of the immense peril they are in. But they are convinced he is a spy. And penetration zero is getting close…

The parallel Inferno has broken through the Earth's crust, unleashing terrible seismic forces and dooming the planet. The Doctor hopes to return and save his world. But the bestial primords are closing in...

The Doctor is trapped in a parallel world that is going up in flames. Can he escape in time to save Earth in his own universe?

The Doctor has escaped the catastrophic destruction of a parallel world. But can he stop Stahlman before he destroys this one?