Thanks for the info everyone!

It's so weird since I guess I always consider the West Batman and Reeves Superman to be "really old" in my mind, but these are even OLDER!!
So interesting to see different versions of things....
At least some of the Dick Tracy serials are also but they're pretty much all public domain. Many of these are put out by companies like Alpha Video which don't have great reputations for quality.
As far as I know, nobody's bothered to put out a DVD of the Captain America serial. That was probably one of the worst superhero-to-serial adaptations. At least the footage I've seen of it doesn't look that great...
I actually watched a LONG time ago "Dick Tracy vs. Scarface" (not the Al Pacino one

) but one of the old films from the 40s or 50s serial I think. It was OK I guess....I happened to see it on VHS; rented it during the height of that whole "Dick Tracy" craze when the Disney film came out....:
(Wasn't there a Flash Gordon show way back in the very early 90s?
What happened to that anyway?)
Plus I can't believe how racist those old Batman serials were! That episode with the Japanese villain sounds incredibly stupid and funny at the same time!

You can’t just have your characters announce how they feel! That makes me feel angry!