The Mechanical Monsters (1941)
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Summary: Robots! Finally, we get Superman beating the hell out of some big robots, which was really the highlight of any Superman story in the 40s, let's be honest. It's always struck me as odd that the robot master just stood there and watches Superman destroy his (probably super expensive) robots, instead of getting the hell out of there. I'm not sure what he expected to happen. Add a madman with a mountain headquarters and amazing visuals that include exploding robots and you've the quintessential Superman short.