Description: Starring Jon Pertwee as the third Doctor. The Doctor joins UNIT's investigation into the mystery surrounding Mars Probe 7. When Recovery 7 reaches Earth, the astronauts are kidnapped and Liz Shaw notices something odd very about the ship, leading to a surprising discovery about the ship's occupants – that they are a group of alien ambassadors who have swapped places with the astronauts. When the Doctor takes Recovery 7 to the Mars Probe to find the astronauts, he soon discovers that all is not as it seems and he has to act quickly in order to avoid all out war.
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