Starring: Sheila Dunn, Nicholas Courtney, Olaf Pooley, Derek Ware, Pat Gorman, Christopher Benjamin, Walter Randall, Derek Newark, Caroline John, Ian Fairbairn, John Levene, David Simeon, Jon Pertwee

Directed by: Douglas Camfield, Barry Letts

"If you break through the Earth's crust now you'll release forces you never dreamed existed!"

20th Century Earth. An unhinged scientist, Professor Stahlman, is attempting the first penetration of the Earth's crust in a top secret drilling project called Inferno. His purpose? To tap into a new energy source at the core. But at what cost? When the Doctor is called in with his companion Liz Shaw to oversee the project, he soon develops grave misgivings. Things begin to go very wrong when a mysterious green substance leaks from the drillhead. A substance which turns all who come into contact with it into alien primeval creatures called Primords.

Meanwhile, the Doctor finds himself transported into a parallel universe identical to 20th Century Earth. The mystery deepens as he finds that although the place, time and people are all the same, no-one seems to know who he is. Only one thing is certain: the drilling must be stopped before the full force of the energy from the core is unleashed, destroying not only this Earth but the one the Doctor has just left behind. Originally transmitted 09/05/70 - 20/06/70.

DVD EXTRAS

Extras to be confirmed, Interactive menus, Bonus footage, Deleted scenes, CommentaryOther documentaries ('Can You Hear the Earth Scream?', 'The UNIT Famil (Part 1)', visual effects, 'The Pertwee Years'), DVD ROM features, Image gallery, Production notes

Soundtrack Languages

 Unknown Sound Format: English

Technical Details

Certification: PG
Duration: 167 mins
Format: DVD
Region: 2
Cat. No: BBCDVD1802(BBC)
Category: Science Fiction:General

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