Detective Comics (1937-) #298

“THE CHALLENGE OF CLAYFACE!” The dynamic duo is part of a charity exchange where they encounter Clayface, a super-criminal with the power to change his body into any shape imaginable thanks to its clay-like constitution! Plus, “THE MAN WHO IMPERSONATED J’ONN J’ONZZ.” When Barry Clark, an impersonation artist imitating his friend J’onn J’onzz, sprains his ankle before attempting a grand comeback, the Martian Manhunter has no choice but to help his friend by impersonating him for his big moment on stage!