Batman #62
Mister X- would be the sideline villain, like Max Shreck in returns
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I second that Clayface (Basil Karlo)- Have Bats punch his lights out, permanately.
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Professor Hugo Strange
he could neatly fill a Ra's sized vacuum in Gotham, and have a think tank with Dr Death & such.
another to die at bat's fist, or that big fuckin canyon