Summer Glau On ‘Chuck’

This video is defiantly a spoiler, so if you don’t want to be spoiled exit now! Your only warning!

Our favorite “Cult” chick from ‘Dollhouse,’ ‘Terminator,’ and ‘Firefly’ is this weeks Greta on ‘Chuck’. Check out this awesome sneak peek of Summer in action below and don’t forget to to in on Monday at 8/7c on NBC.