Harold Hadley was a U.S. Air Force aide of General Wade Eiling and a member of the Captain Atom Project. Secretly, Hadley was an agent of the Manhunters. Deeming Captain Atom as one of many threats to the Manhunters, Hadley plotted to publicly expose the Captain Atom Project but his plan was discovered by Eiling, who personally killed him.
- 7 Appearances of Harold Hadley (New Earth)
- 2 Images featuring Harold Hadley (New Earth)
- Quotations by or about Harold Hadley (New Earth)
- Character Gallery: Harold Hadley (New Earth)