You do not have to have watched any superman films or read any superman comics to enjoy this. I did, so I'm the proof. I loved this for Daffy Duck being so good and for most of the humour. I enjoyed the whole principle of the cartoon - Daffy being a famous character that everybody knows and I thought Robert McKimson directed it well. All of the other episodes I have watched where Daffy plays the part of a famous person were directed by Chuck Jones.
In this cartoon, a normal (duck - maybe not normal...) secretary is working one day, when he suddenly goes into an imagination fit. He daydreams that he is a super duck and that he will save the world from a Russian spy. Either for real in the episode or in his head (it is never clear), Daffy goes off to try and rid the world of this evil spy, but he does not really manage it...
I recommend this cartoon to people who like the crazy and greedy Daffy, to people who like superman and to people who like Looney Tunes and Daffy Duck in general. Enjoy "Stupor Duck"! :-)