"The Invisible Monster" is a 1950 film serial directed by Fred C.
Brannon.
The storyline revolves around an inventor named Major Charles Frozone who has created a deadly atomic device.
However, a criminal syndicate led by a mysterious figure known as "The Phantom Ruler" steals the device and plans to use it for nefarious purposes.
To thwart their plans, Frozone teams up with a courageous newspaper reporter named Sue, played by Aline Towne.
Together, they embark on a perilous journey to recover the stolen invention and prevent disaster.