Yvonne Jaqueline Strzechowski (born 30 July 1982), better known by the stage name Yvonne Strahovski (/strəˈhɒv.ski/), is an Australian actress. She is known for portraying CIA Agent Sarah Walker in the NBC television series Chuck (2007–2012), Hannah McKay in the Showtime series Dexter (2012–2013), for her role in the 2014 fantasy action film I, Frankenstein and also as Peg Mooring in the action/adventure movie Lego: The Adventures of Clutch Powers (2010). She is also the voice and model of Miranda Lawson in the Mass Effect video game series and appeared as CIA agent Kate Morgan in 24: Live Another Day.