Source: Superman (1948) and Atom Man vs. Superman (1950) movie serials
THIS ONE features a good pot-pourri of Superman action, Daily Planet business, and Lois Lane as a victim of the Spider Lady (about time someone 'ported the Queen of the Underworld into the comics!). You might also enjoy the B-movie origin of Superman, complete with exploding Krypton and Clark's childhood.
The serial was a huge success and another was soon made, this one featuring Atom Man, a villain who turned out to be none other than Lex Luthor. Actor Lyle Talbot wore a bald cap for the role, and we'd wait until, what, Smallville?! before a screen Lex would actually show up to set with his own bald head. Oh vanity! Serials were disappearing by the 50s, the form really showing up on television, and Alyn WAS offered the television show. Alas, he made George Reeves' day be declining.
BONUS COSTUME ODDITY