The Spider's Web (1938)

A crime fighter known as The Spider battles a villain called The Octopus, who is out to sabotage America and install his own government.

Jeff King in his experimental rocket suit battles the evil Dr. Vulcan.

A hero single-handedly sets himself against Martians trying to assume control of Earth.

When a deadly Nitron ray strikes Earth, Flash Gordon and his friends travel to Mars to battle Ming the Merciless and his new ally Queen Azura.

Dick Tracy battles spies and saboteurs in his efforts to bring to justice the Stark gang, a criminal family led by the vicious Pa Stark.

A mad doctor named Zanoff uses a drug to bring himself back from the dead after his execution in prison. Dick Tracy sets out to capture Zanoff before he can put his criminal gang back together again.

Captain America is a 1944 Republic black-and-white serial film loosely based on the Timely Comics character Captain America. It was the last Republic serial made about a superhero.

Atom Man vs. Superman (1950), Columbia's 43rd serial and the second  live-action Superman screen appearance, both featuring Kirk Alyn as  Superman,Superman, Lois, and Jimmy combat the evil Spider Lady. Lots of  cliffhanger excitement while the Spider Lady and her gang use Kryptonite against Superman in an effort to gain a relativity Reducer Ray.

The Shadow was the ninth serial released by Columbia Pictures. It was based upon the classic radio series and pulp magazine character with the same name. http://otrdigital.com  or http://oldtimeradiodvd.com