Torlakh
Torlakh was a Zygon who was trapped on Earth during the late 20th and 21st century. He and his superior, Kritakh, had been sent to Earth in order to release nuclear waste into the air, so that 100 years later the planet would be warmer and more hospitable by Zygons. Torlakh was reckless, often trying to avoid duties to "shag" with human females. Kritakh would often have to remind him to concentrate on the mission.
In order to blend in more, Torlakh took the appearance of convict Bob Calhoun. Similarly, Kritakh stole the body of Michael Kirkwood. However, Kritakh soon slipped too far into the persona of Kirkwood, and began to think that he was indeed him. "Kirkwood" began to see a doctor named Lauren Anderson about his visions of being a Zygon. Torlakh began to stalk the woman, with the hope that she would help Kritakh remember who he was. He became angered when she made him worse, even breaking into her house and attacking her.
With her cooperation, Torlakh turned Lauren into a Zygon, showing her how to shape shift. She betrayed him, reuniting with Kritakh to try and defeat him. They returned to one of the factories they had visited before, deactivating the link present in the real Michael Kirkwood and Bob Calhoun, thus making Bob return to his normal Zygon body temporarily, until he regained his apperance as Bob.
Torlakh took revenge on them by taking the form of Lauren and going on a killing spree at the hospital she worked at. Lauren, now wanted by the police, met him at her house, only to shoot him, leaving what looked like her body behind. (BBV: Zygon: When Being You Just Isn't Enough)
