In an article titled "Chuck Flashback! We Spy 28 Fun Guest Stars" , TV Line has listed 28 memorable guest stars from Chuck ; Summer Glau made the list for her guest appearance as a Greta in episode 8 of season 4 "Chuck Versus the Fear of Death".
Source : TV Line
More pictures of Summer Glau in Chuck on the Gallery.
Chuck is on SciFiNow Covers.
SciFiNow is a science fiction, horror, cult TV and fantasy UK magazine. Inside the issue #56 of the magazine, on stands on July 2011, Chuck gets a four-page article for its incredible and so far successfull struggle to survive in a non-scifi-friendly tv universe. The covers says : "How tv's hottest geeks beat the network and the secrets to season five".
Magazine Scans > Scans from 2011 > SciFiNow issue 56 - July 2011