Batman: Minerva, Mayhem And Millionaires (Season 3: Ep. 26) (1968)

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Minerva has been using her "Deepest Secret Extractor," disguised as a piece of equipment at her mineral spa, to discover where her wealthiest customers hide their valuables. With this info in hand, Minerva has been able to pull off a string of robberies with ease. When Batman and Robin's investigation is cut short by the villainess, butler Alfred goes undercover to help foil her criminal operations.