I grew up on Superman comics. They were 12 cents apiece, and they were read, not 'collected' in little sealed bags.
He was created by American Jerry Siegel and Canadian Joe Shuster in 1932, and began appearing in comics in 1938. He came to radio in 1940, and ran until 1951, voiced by Clayton Bud Collyer.
Sample shows - left click headphones to listen, right-click & save-as to download
||The Shark(1 of 2)
||The audition episode, brought to you by Blankarene, breakfast cereal of Supermen!|
||The Shark(2 of 2)
||Superman helps the Navy foil a sabotage plot.
||Baby From Krypton
||Baby Kal-el is sent by his parents from an exploding Krypton, comes to earth as Superman.|
||Clark Kent Reporter
||Clark/Superman heads west for his first big scoop - find The Wolf.|
||Superman foils a disaster planned by The Wolf.
||Kent Captured By The Wolf
||The Wolf tortures that meddling reporter Clark Kent for information. Good luck.|
||Clark Kent Imprisoned
||The Wolf, having tortured Clark to no avail, leaves him imprisoned to die alone.|
||Menace to the Silver Clipper
||The Wolf meets his match.
||Dr Dalgrins Atomic Beam Machine
||The Yellow Mask steals a super weapon.|
||Atomic Fuel Cylinders Stolen
||The Atomic Beam Machine needs special cylinders to work, and the Yellow Mask needs them.|
||Threat To The Planet Building
||Curses! The Yellow Mask foiled at the last minute.