Someone disguised as Superman is committing robberies all over Metropolis. He's doing it under orders from The Boss (that's all he's ever called--and he sounds like Orson Welles!). Immediately the police start searching for Superman. One night Lois Lane and Clark Kent are covering the opera. The fake Superman decides to rob the patrons there that night. Lois scares him off---but Clark decides to meet him face to face and get to the bottom of this.
This has to be one of the quickest-moving Superman cartoons I've ever seen. It moves like lightning and (for once) Lois is NOT captured or put in danger. I do love how she casually jumps into the police car (in her beautiful new dress) to join them as they go after the villain. It's never explained how they KNOW where The Boss is though. Who cares? This is fun, fast and beautifully animated. A definite 9.