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| | Doctor Who |
 | | In the series, The Doctor is not subject to the normal constraints of mortal life as he is a Time Lord, a race from the planet Gallifrey that has mastered the secrets of time, but which for the most part keeps them secret. |
 | | However, the factor which probably most ensured the series captured the public's attention was the introduction of the Daleks in the second storyline: a lethal race of metal-armoured mutants, whose chief role in the great scheme of things would appear to be, as they frequently observe in their instantly-recognisable metallic voices, to 'Exterminate!'. |
 | | The changing of actors is explained within the series by the Time Lords' ability to "regenerate" after suffering mortal injury, illness, or age; the process repairs and rejuvenates all damage, but as a side-effect it reconfigures the Time Lords' physical appearance semi-randomly and also affects their personalities. |
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