Thaddeus Thawne is a legacy name used by several enemies of the Flash. The original was President Thawne of Earthgov, an evil United Planets politician in the 30th Century. His name was also taken by Inertia, an evil clone of Impulse. They are members of the Thawne family, descended from Barry Allen's long-lost twin Cobalt Blue. Professor Zoom is another member of this family. Thaddeus Thawne was created by Mark Waid and Humberto Ramos, first appearing in Impulse #25. (1997)

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