The Zygons are a race of squid-like shapeshifting aliens that have control of a cyborg beast named the Skarsen and they are villains in the Doctor Who series. They have so far appeared in Terror of the Zygons (1975), The Day of the Doctor (2013) and the two parter The Zygon Invasion and The Zygon Inversion (2015).
Sometime over a thousand years ago, a Zygon battle ship with a crew of few crashed, in the bottom of loch ness. Upon learning in the 1970's that their home planet had been destroyed, and a large number of their race's survivors were heading to Earth, they sprang into action planning to take the planet, and use it as ther new home. They used their beast, the Skarsen to kill and scare the locals. Their plan was to repopulate Earth with their own people.
The 4th Doctor defeated the Zygons by blowing up their ship, killing two of the Zygons and then Broton the Warlord is shot down by several unit soliders. The Skarsen leaves to make a home in loch ness and is still there to this day as the Loch Ness Monster.
In 1562 a group of Zygons were based in England and investigated by the 10th Doctor, who proposed to Elizabeth I thinking she was a Zygon. However he then realised the horse was one, but it then shapeshifted into Elizabeth. The 11th and War Doctors then arrived through time windows opened by The Moment. Elizabeth killed the Zygon impersonating her and impersonated it, allowing the Doctors to find out the Zygons plans. The Zygons placed themselves in stasis in Paintings, and in 2013 emerged to take over the Earth.
- In 2008, a toy of a basic Zygon was made, it is relatively rare outside of the United Kingdom (England).
- a similar model of a Zygon was also released as part of a Doctor Who collector's set.
- Zygons are frequently listed as an alien race fans of the show would like to see return, with the show known to frequently "recycle" enemies the Zygons may well appear in the future (but no official word has yet surfaced).