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In the seventh episode of a seven-part story arc, Samantha and Darrin conclude their vacation abroad with a visit to an ancient British castle hotel. Like most such structures, the castle is haunted by a ghost, namely Henry, Eighth Duke of Whitset (Patrick Horgan), who falls madly in love with Sam. When she refuses to return his affections, the persistent Henry possesses the body of Darrin, who of course gets into a passel of trouble as a consequence. Written by Ed Jurist, "The Ghost Who Made a Spectre of Himself" originally aired on October 27, 1971.