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John McGiver guest stars in this episode as famed British butterfly collector Lord Beasley Waterford. Thanks to the ingenuity of the scriptwriter, Lord Waterford has arrived on the Castaways' island, in pursuit of the elusive pussycat swallowtail. Of course, the Castaways hope that his Lordship will rescue them and take them back to civilization--but he refuses to leave the island until he has added the aforementioned rare specimen to his collection.