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He told TV Squad that Vivian, recently revealed to be the daughter of the villainous Volkoff (Timothy Dalton), will be "tempted by the dark side" in upcoming episodes.
"She walks the line between being a Volkoff and being someone [better]," he suggested.
Fedak also compared the revelations surrounding Vivian's parentage to the previous mystery of Chuck's own father, calling her arc a "bizarro, dark version of Chuck's story".
Lauren Cohan previously hinted that her character could return to the show, following an initial five-episode arc.
Chuck continues on Mondays at 8/7c on NBC.
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