It's time for the most fabulous Superman parody of all time!
No, a full decade and a half before Kurtzman & Wood's poke at Kal-El, Timely Comics and Harry Douglas beat them to the punch:
Now, Superman hadn't been around for all that long yet, and perhaps they were a teeny bit afraid of getting sued, so Stuporman isn't as trenchant and detailed as Mad's parody. At times it plays as a more generic satire on all costumed heroes...
Did I mention that Stuporman likes naps?
From Daring Mystery Comics #6 (1940)