A Zygon who was part of a group stuck on Earth after their ship landed in 1562 took the form of Kate Stewart after capturing her in the 21st century, having recently left a stasis cube.
In the Under Gallery, the Zygon attacked Clara Oswald, but fell back when the latter got hold of a vortex manipulator. Later, the War, Tenth and Eleventh Doctors erased the memories of both the humans and their Zygon counterparts, and peace was restored. (TV: The Day of the Doctor)
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