Astronauts rescued from a mission to mars are kidnapped when they arrive back on earth. They seem to have been irradiated, and can now kill people merely by touching them. But the Doctor discovers the astronauts have been replaced with Alien ambassadors who are being forced to behave in a hostile manner. With The Doctor traveling to the alien mother ship, and Liz kidnapped, The Brigadier is left wondering who to trust.
Top Cast
Jon Pertwee as The Doctor
Caroline John as Liz Shaw
Nicholas Courtney as Brigadier Lethbridge-Stewart
Ronald Allen as Ralph Cornish
John Abineri as Carrington
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