This character 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.

Clyde Mardon is the brother and partner-in-crime of Mark Mardon, better known as the Weather Wizard. When Mark was apprehended by Citizen Cold, Clyde was either killed or ran, according to Mirror Master, who saw the wreckage of their base from the Mirror World.