Chuck and Sarah's wedding prep includes one final detail: ensuring that the mother of the groom (recurring guest star LINDA HAMILTON) makes it to the ceremony alive. Meanwhile, Morgan's responsibilities as Best Man include his most dangerous mission yet, as he faces Vivian Volkoff (recurring guest star LAUREN COHAN). Elsewhere, as Ellie tends to the last details of the rehearsal dinner, she seeks help from an unlikely source. Recurring guest stars MEKENNA MELVIN and RAY WISE also appear.
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