Doctor Harold Hadley is a medical for the United States government. Under the orders from Wade Eiling, Dr. Hadley performed constant tests and surgeries on Bette Sans Souci, better known as Plastique.
When Plastique escaped, she hunted down Dr. Hadley but was ambushed by Eiling before she was able to kill Hadley. The Flash helped Sans Souci escape, and Dr. Hadley escaped with his life. 
- This version of the character is exclusive to the continuity of the television series The Flash, its tie-in comic book series, and its related television series. It is an adaptation of Harold Hadley. The original character was created by Cary Bates and Pat Broderick and first appeared in Captain Atom #1.
- Harold Hadley is portrayed by Jan Bos.
- 1 Appearances of Harold Hadley (Arrow)
- 1 Images featuring Harold Hadley (Arrow)
- Quotations by or about Harold Hadley (Arrow)
- Character Gallery: Harold Hadley (Arrow)
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