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Classic Who S7 • Serial 4 · (7 episodes)

Inferno

82% 982 votes

First aired Saturday, May 9, 1970
Production Code DDD
Written by Don Houghton
Runtime 175 minutes
Inventory: (Potential Spoilers!) Bessie
Synopsis

UNIT is providing security cover at an experimental drilling project at Eastchester, designed to penetrate the Earth's crust and release a previously untapped source of energy. Soon, however, the drill head starts to leak an oily green liquid that transforms those who touch it into vicious primeval creatures with a craving for heat.

7 Episodes:

First aired Saturday, May 9, 1970
Runtime 25 minutes
Written by Don Houghton
Directed by Douglas Camfield
UK Viewers 5.7 million
Appreciation Index 61

Synopsis

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…

First aired Saturday, May 16, 1970
Runtime 25 minutes
Written by Don Houghton
Directed by Douglas Camfield
UK Viewers 5.9 million
Appreciation Index 61

Synopsis

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!

First aired Saturday, May 23, 1970
Runtime 25 minutes
Written by Don Houghton
UK Viewers 4.8 million
Appreciation Index 60

Synopsis

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.

First aired Saturday, May 30, 1970
Runtime 25 minutes
Written by Don Houghton
UK Viewers 6 million
Appreciation Index 60

Synopsis

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…

First aired Saturday, June 6, 1970
Runtime 25 minutes
Written by Don Houghton
UK Viewers 5.4 million

Synopsis

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...

First aired Saturday, June 13, 1970
Runtime 25 minutes
Written by Don Houghton
UK Viewers 6.7 million
Appreciation Index 58

Synopsis

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?

First aired Saturday, June 20, 1970
Runtime 25 minutes
Written by Don Houghton
UK Viewers 5.5 million
Appreciation Index 60

Synopsis

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

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Primords