History of character has not yet been written.
- gases that cause insanity
- This version of Jest-Master (Earth-One), 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.
- 1 Appearances of Jest-Master (Earth-One)
- 1 Images featuring Jest-Master (Earth-One)
- Quotations by or about Jest-Master (Earth-One)
- Character Gallery: Jest-Master (Earth-One)
This character is or was primarily an enemy of the Justice League, in any of its various incarnations. This template will categorize articles that include it into the category "Justice League Villains."