[SPOILER ALERT! This story contains major plot points from the upcoming season of Dexter. Read at your own risk.]
Sarah Walker, no more. Yvonne Strahovski
, formerly known as Chuck
's sexy secret agent, is about to shock and awe audiences this fall when she takes on a killer new role on Showtime's Dexter
. Dexter Season 7 Scoop: How will Deb react to Dexter's secret?
Hannah McKay (Strahovski) will cross paths with Dexter (Michael C. Hall