The Ambassadors of Death

The Doctor and Liz join the investigation regarding Mars Probe 7, which has not communicated with Space Control since setting back from Mars seven months ago.  A further vessel, Recovery 7, is encountering similar problems.  When Recovery 7 returns to Earth, the ship is found to be crewed by three alien ambassadors…

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Robot

While the Doctor is recovering from his latest regeneration, there are a number of thefts of secret plans threatening global security, with the guards killed. The culprit appears to be a robot, created by the National Institute for Advanced Scientific Research, however, his basic programming prevents him from killing.

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