Overview

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.

Genres

Cast

Jon Pertwee

The Doctor

Caroline John

Liz Shaw

Nicholas Courtney

Brigadier Lethbridge-Stewart

Ronald Allen

Ralph Cornish

John Abineri

Carrington

Michael Wisher

John Wakefield

John Moreno

Dobson

William Dysart

Reegan

Cyril Shaps

Lennox

Gordon Sterne

Heldorf

Max Faulkner

UNIT Soldier

John Levene

Sergeant Benton