Ol' Clayface's origin is almost a muddied as Hawkman's. Yet, I love what Bruce Timm and the gang did with him the animated series. In my mind that is the definitive Clayface. Curious how so much of what they did in that series has become definitive. Imagine if they made a movie based on that series. OMG it would be sick. Dare I say in the right hands that Batman could eclipse Nolan's.
Hatter's next, or maybe Bane. Haven't decided.
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