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While the Brigadier investigates a loss of contact with Mars Probe 7, the Doctor realises signals coming from the probe are of extra-terrestrial origin.
Did You Know?
This episode is the only from this story to survive in its original color form in the BBC archives. See more
In "The Ambassadors of Death": Episode 4, a UNIT soldier is killed when he touches the same barrier as the alien. In Episode 6, he's alive and well and back at work. See more
Let's see what he's got to say for himself.
The opening credit sequence for all episodes of the story is split into two parts and the episode title is presented in two separate lines, the second "OF DEATH" part being larger and accompanied by a dramatic audio sting. See more