Kustler was a researcher on the top-secret Station 7 and an assistant to Professor Weston.
Some time after Weston's departure from the station, Kustler worked with Hadleigh to gain control over acquired Dalek technology to use against the Daleks in the war. When the station was discovered by the Daleks, the ones on the station that were believed to have been converted were ordered to defend the crew. However, they turned on the humans and killed many of them, including Kustler. (COMIC: The Only Good Dalek)