Detective Comics#298(1961)

In the early morning, Matt Hagen dives in search of hidden wealth and finds a strange protoplasm in an undiscovered grotto. It turns him into a being of clay where he can change himself into anything he can imagine. That afternoon, at a charity photoshoot with Batman (Bruce Wayne) and Robin (Dick Grayson), a noted philanthropist gives $100,000 in cash to a police benefit fund. Hagen attacks, changing into a giant python, a giant saw blade, and a giant eagle. As the eagle, he flies away, stealing the money. The Gotham Gazette goes on to name him Clay-Face. Clay-Face appears later at a museum, but starts to lose his powers. Batman and Robin try to stop him, but he tricks the duo by disguising himself as one of the museum's staff. He enters the protoplasm again and his power returns. Disguised, he gathers some other criminals and robs a Chinatown museum. When Batman and Robin investigate they find the clay substance and track down one of Clay-Face's associates, Joe Shank, to the Gotham Natural History Museum. There, they attack Clay-Face and his thugs. Clay-Face defeats Batman and Robin and hides in a nearby tree. Batman recovers soon enough to chase after Clay-Face's thugs. Once Robin recovers he pretends to still be unconscious and, using the Whirly-Bat, tracks Clay-Face to a big mansion at the end of Grovehill Road. Inside, Batman and Robin fight Clay-Face until he is about to lose his powers. They keep him locked inside with them and Clay-Face loses his powers and turns back into just Matt Hagen. After refusing to reveal the origins of his powers, Hagen is imprisoned.