Hadleigh

 was a researcher on the top-secret Station 7, and assistant to Dr Weston. Some time after Weston's departure from the station, he worked with Kustler to gain control over acquired Dalek technology to use against the Daleks in the war. He found out that the Daleks converted to be controlled by them were in fact only a deceptive tactic to strike back at the right time and destroy their research. Because of this discovery, he was locked into a section of the Station which held a part of Skaro, including a Slyther and Varga plants, by the Daleks. He was found by the Doctor and Amy Pond after having just been infected by a Varga plant, and turned into one himself. His body was later retreived by his comrades.