Boris Karloff brings his familiar adroit horror touch to the role of an aging somewhat nutty ex-stage mesmerist who aims to complete his experiments by dominating the brain of a young subject. Karloff himself is dominated by his wife (Catherine Lacey), who was his stage assistant.
Karloff persuades Ian Ogilvy, who plays a feckless, slightly moody youth, to become the subject for his experiments. Initial experiments work well as Karloff sees in the youth a tool who may be able to benefit mankind under his influence. But Karloff’s wife, motivated by greed, insists that the lad should work for their benefit for a while.