History of character is unknown.
- This version of Headmaster, including all history and corresponding appearances, was initially erased from existence following the collapse of the original Multiverse in the 1985-86 Crisis on Infinite Earths limited series. However the ending of Convergence retroactively prevented that collapse saving all the alternate realities though in an "evolved" form. Even though versions of the character may have since appeared, this information does not apply to those versions.
- 2 Appearances of Headmaster (Earth-One)
- 2 Images featuring Headmaster (Earth-One)
- Quotations by or about Headmaster (Earth-One)
- Character Gallery: Headmaster (Earth-One)
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This character, team or organization, is or was primarily an enemy of the Batman, or the Batman Family as a whole. This template will categorize articles that include it into the category "Batman Villains."