Yvonne Jaqueline Strzechowski, known professionally as Yvonne Strahovski, is an Australian actress. Primarily noted for her roles in dramatic television, she has received numerous awards and nominations, including two Primetime Emmy Award nominations and three Screen Actors Guild Award nominations. She is best known for 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 nominations for two Primetime Emmy Awards, three Screen Actors Guild Awards and a Golden Globe Award. 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), The Predator (2018) and The Tomorrow War (2021). She also voiced Miranda Lawson in the Mass Effect video game series and Batwoman in the animated superhero film Batman: Bad Blood (2016).