Gevaunt was a Quoll from the Reft Sector.
He travelled to Kolpasha and murdered several people, including Brenna Frall and Dara Clayd.
Since his race could not eat humans, Gevaunt planned to get them addicted to the Eternal Youth Drug, which would transform them into edible material for the Quoll's. However, Gevaunt's plans were stopped when the Fourth Doctor killed him by giving him an overdose of the drug. (COMIC: Victims)