The Invisible Monster is a 1950 Republic film serial, starring Richard Webb and Aline Towne.

[2] Covered from head to toe in formula-treated cloth, he thus moves about unseen, presently with the objective of stealing enough money and formula components to render an entire army of willing followers invisible.

Two henchmen assist him, along with several illegal aliens smuggled into the US by him and used to infiltrate, as employees, possible sites for him to later rob while invisible.

Eventually they discover the invisibility fluid and lamp, and the Phantom Ruler is killed when he trips over an open high-power electric cable he had laid on the floor of his den to do in the forces of law and order closing in upon him.

[1] The Invisible Monster was one of twenty-six Republic serials edited to a uniform runtime of 100 minutes and syndicated directly to television as a package of TV Movies in 1966.