Last week, Chuck's future took a detour when he felt compelled to take one for Team USA and put the kibosh on his simmering romance with CIA handler Sarah. This Monday at 8 pm/ET, NBC's Chuck delves into the past, shedding light on how a decidedly awkward "Jenny Burton" came to be the sexy and savvy Sarah we know today. Yvonne Strahovski gave us a look at the illuminating episode, which includes a literally kick-ass fight scene with guest star Nicole Richie.