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Hadleigh was a researcher on the top-secret Station 7 and an assistant to Professor Weston.

Some time after Weston's departure from the station, Hadleigh worked with Kustler to gain control over acquired Dalek technology to use against the Daleks in the war. He found out the Daleks converted by them were only a deceptive tactic to strike back at the right time and destroy their research. Because of this discovery, the Daleks locked him in a section of the station which held Skaro life forms, including a Slyther and Varga plants. He was found by the Eleventh Doctor and Amy Pond after he had been infected by a Varga plant and turned into one himself. His corpse was retrieved by his comrades. (COMIC: The Only Good Dalek)