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"What you tell me is appalling. The authorities on Earth had no knowledge of this"
|Episode Title||Premiere Date|
Something has gone seriously wrong with Mars Probe 7. With no contact from the astronauts since the rocket started its return journey from Mars, Space Control is now extremely worried about the fate of the crew. A rescue mission recovers something — but whatever it is, it certainly isn't human. To find out what has happened to the astronauts, the Doctor must head into space without the TARDIS...
The Doctor: Jon Pertwee
Liz Shaw: Caroline John
Brigadier Lethbridge-Stewart: Nicholas Courtney
Ralph Cornish: Ronald Allen
General Carrington: John Abineri
John Wakefield: Michael Wisher
Producer: Barry Letts
Director: Michael Ferguson
Scriptwriters: David Whitaker, Malcolm Hulke, Trevor Ray and Terrance Dicks