Alien
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Alien was a broad, subjective term. It could be applied as a noun or an adjective for any entity, object, place or practice which was not familiar. When referring to entities, it was used for sentient and non-sentient organic creatures, as well as robots.[source needed] Usually, this meant entities which were not native to Earth and were "alien" from the viewpoint of the human race. However, to any species not native to Earth, a human would be alien.[source needed]
The Third Doctor referred to the Silurians as alien beings even after he discovered they had ruled the planet Earth millions of years before. (TV: Doctor Who and the Silurians) The Eleventh Doctor later stated that they were not aliens but rather "Earth...liens". (TV: The Hungry Earth)
