Vivian McArthur Winterbottom, formerly known as Vivian McArthur Volkoff, is the daughter of MI6 scientist Hartley Winterbottom, who assumed the fictitious identity as Alexei Volkoff. She was the main antagonist of the later half of Season Four, and is portrayed by Lauren Cohan of Supernatural and The Walking Dead fame. She is an heiress who studied at the London School of Economics. Vivian first appeared in the Season Four episode, "Chuck Versus the Masquerade".