Matt Hagen was the second criminal who adopted the alias of Clayface in Gotham City, making him an enemy of the Batman Family. Unlike the first individual to use that name, Basil Karlo, Hagen adopted the Clayface identity after the molecular structure of his body was accidentally changed into clay, which allowed him to transform his body into anything he desired. He has been a member of the Mud Pack, the Anti-Justice League, the Secret Society of Super-Villains, and the League of Shadows.
Matt Hagen was created by Bill Finger and Sheldon Moldoff, first appearing in the Detective Comics #298 (1961).
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