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Batman, season 2 episode 33 «The Sandman Cometh »: air date December 28, 1966. Episode overview, season trailer and the cast of Batman.
Catwoman and the Sandman have teamed up, and they're after the fortunes of J. Pauline Spaghetti, a rich insomniac. Catwoman pulls a publicity stunt, getting the Sandman (under the guise of "Dr. Somnambula") an invitation to Spaghetti's penthouse - and her financial records.