I love the Fleischer Superman cartoons. The animation is smooth and fluid with vivid colors. The distinct art-deco style, vintage science fiction imagery, and use of noirish shadows gave them a look unlike any other cartoons. The music and voice work is superb. They're fun, accessible, enduring animation classics. While this is a cartoon from Fleischer Studios' successor, Famous Studios, it still tries to maintain the Fleischer style.
In the eleventh in the series, someone disguised as Superman is committing crimes all over Metropolis. Lois and Clark are assigned to cover the opera and, while there, Lois has a run-in with the impostor. Clark wastes no time changing into his red & blues and confronting the fake. Impostor Superman leads the real Supes to his boss, who won't be taken easily. The second Superman short from Famous is their best and one of the most different in the whole series. It's the closest any of the shorts come to being a comedy. The fake Superman is very funny. An interesting note is that Jack Mercer and Jackson Beck, who voice the fake Superman and his boss respectively, also did the voices of Popeye and Bluto in Popeye cartoons.