Natascha Abigail Taylor (born 14 December 1971), known professionally as Natascha McElhone (/ˈmækəlhoʊn/), is an English actress and producer, who has worked extensively in television and film in both the United Kingdom and the United States. She is known to television audiences for her roles as Karen on Californication (2007–14), First Lady Alex Kirkman on Designated Survivor (2016–17), Penelope Knatchbull, Lady Romsey on The Crown (2022), and Dr. Catherine Halsey on Halo (2022