The subject of this article has been mentioned only and never actually shown in a comic book or on-screen. Despite their lack of physical appearances, information about them might still be relevant or interesting or at least worthy of documentation. Anything known about them is to be considered second-hand information.
Mirror Master was an enemy of the Flash who used a Mirror Gun to fight the speedster.
Flash Villain(s) This character, team, or organization, has been primarily an enemy of any or all of the various incarnations of the Flash. This template will categorize articles that include it into the category "Flash Villains."
Rogues Gallery This character is or was a member of the Rogues, a loose collection of enemies to the Flash, in any of its various incarnations. They are a team of highly effective super-villains with their own internal code that prevents them from killing speedsters.
This template will categorize articles that include it into the "Rogues Gallery members category."
