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Prepared for television in 1966, Slaves of the Invisible Monster is the feature-length abridgement of the 1950 Republic serial The Invisible Monster (which explains the presence of several individuals in the cast who died in the 16-year interim). The story is set in motion by the Phantom Ruler (Stanley Price), who uses his power to make himself invisible for nefarious purposes. An insurance company investigator (played by Richard Webb, later TV's Captain Midnight) vows to put an end to the Phantom Ruler's crime spree. Originally, this took up 12 chapters; the feature version has only 100 minutes at its disposal, but still manages to incorporate most of the serial's best action highlights. Aline Towne co-stars as Webb's eminently kidnappable fiancée. Watch for John Hamilton, Perry White on the old Superman series, in an unbilled cameo as one of the Phantom Ruler's minions.