Yvonne Jaqueline Strzechowski, known professionally as Yvonne Strahovski, is an Australian actress. She is best known for her roles as CIA Agent Sarah Walker in the NBC spy drama series Chuck (2007–2012), Hannah McKay in the Showtime drama series Dexter (2012–2013), and CIA Agent Kate Morgan in the Fox event series 24: Live Another Day (2014). She stars as Serena Joy Waterford in the Hulu drama series The Handmaid's Tale (2017–present), for which she has received a Primetime Emmy Award nomination. Strahovski's other notable works include Lego: The Adventures of Clutch Powers (2010), Killer Elite (2011), I, Frankenstein (2014), The Astronaut Wives Club (2015), Manhattan Night (2016), He's Out There (2018), and The Predator (2018). She also voiced Miranda Lawson in the Mass Effect video game series and Batwoman in the animated superhero film Batman: Bad Blood (2016).