O'Neill is a wealthy, independent playboy adventurer who attracts the anger of Fang Gow, the "inscrutable and vengeful enemy of the Human Race," who is a ruler in China and has cult members all around the world. Barry and his assistant Le Grand take on and defeat the forces of Fang Gow, and then move on to attack and defeat other international criminals, becoming the "ace spy-smashing team of the French Intelligence Office." Barry has no superpowers but is rich and good in a fight.
- This version of Barry O'Neill, including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. Even though versions of the character may have since appeared, this information does not apply to those versions.
- Appearances of Barry O'Neill (Earth-Two)
- Images featuring Barry O'Neill (Earth-Two)
- Quotations by or about Barry O'Neill (Earth-Two)
- Character Gallery: Barry O'Neill (Earth-Two)