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The Zygons are unique on this list as they have only ever made one official on-screen appearance in Doctor Who. Seen in 1975’s “Terror of the Zygons,” they are an alien race with shape-shifting abilities and are able to take the form of another living being. Their technology is organic is nature, meaning their ships and the equipment they use is actually alive. The 10th Doctor, David Tennant, has also stated that they are his favorite Doctor Who monsters.
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Last Updated: on 4/25/2013 6:41:00 PM Pacific Daylight Time (1:41 AM GMT)
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