Greta 4 (Summer Glau) was almost compromised by Jeff Barnes and Lester Patel in "Chuck Versus the Fear of Death", after they noticed that the string of new employees all had the name "Greta". The CIA assassin seemingly disappears from sight and reappears unexpectedly, drawing suspicion from the two. When they begin stalking her, Greta becomes annoyed with them and complains to Morgan, requesting that he stop them from prying, and threatening to take care of them herself if he doesn't.