Sarah Lisa Bartowski (née Walker)[4] is the alias[2] of one of the main characters of the fictional televisheni onyesha Chuck on NBC. Her first and middle names were revealed to be Sam Lisa in "Chuck Versus the Fake Name" and "Chuck Versus the Wookiee". She used her real middle name with her Sarah Walker identity, as shown in "Chuck Versus the Family Volkoff". Her real maiden name was never revealed. She is portrayed kwa Yvonne Strahovski and is one of two agents assigned kwa the NSA and CIA to protect Chuck Bartowski after he unwittingly downloads the secret government computer known as the Intersect...