Here's the official synopsis for Chuck, Season 4 Episode 20: "Chuck vs. The Family Volkoff"
IN ORDER TO SAVE THE LIFE OF A FORMER ALLY, CHUCK MUST JOIN FORCES WITH HIS GREATEST FOE—LINDA HAMILTON, LAUREN COHAN, MEKENNA MELVIN, AND TIMOTHY DALTON GUEST STAR—A bad day gets worse when Sarah (Yvonne Strahovski) throws Chuck (Zachary Levi) a surprising relationship curveball as the CIA orders Vivian Volkoff (guest star Lauren Cohan) assassinated. In order to prove Vivian's innocence, Chuck must put his trust in a dangerous ally her father Alexei Volkoff (guest star Timothy Dalton). Meanwhile, Ellie (Sarah Lancaster) suspects that her mother (guest star Linda Hamilton) is interfering with the search into her father's past. Joshua Gomez, Ryan McPartlin, Adam Baldwin and Bonita Friedericy also star.Airs: Monday, April 11th @ 8/7c on NBC. Labels: NBC, Season 4, Spoilers, Synopsis