Post Description

Regular cast:
Doctor Who (Tom Baker)
Sarah Jane Smith (Elisabeth Sladen) 
Harry Sullivan (Ian Marter) 

The TARDIS arrives on an apparently deserted and deactivated space station Nerva, otherwise known as the Ark, orbiting Earth in the far future. There the Doctor, Sarah and Harry discover the last survivors of the human race held in suspended animation, Earth having been evacuated thousands of years earlier when solar flares threatened to destroy all life

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