Zygon:

The Zygon are an extraterrestrial race whose homeworld was destroyed icenturies ago in a stellar explosion. A craft escaped and somehow made it to Earth, where it then crashed into Loch Ness. When the Fourth Doctor encountered the Zygons, they were led by a warlord named Broton. Broton wished to conquer the world to allow a refugee fleet of Zygon to colonize Earth.

The Zygons have shape-shifting abilities, allowing them to replicate the appearance of another being, but they must keep the subject alive in order to use its body print. This skill was vital in their concealment and in their scheme to seize power despite their small numbers. The Zygons were also accompanied by a large, armoured, dinosaur-like cyborg creature called the Skarasen. Broton planned to unleash the Skarasen , or Loch Ness Monster as it had become known, as part of a bid to conquer the Earth. The plan was foiled and both he and his crew were killed due to the intervention of the Fourth Doctor and the U.N.I.T.+

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