I'm not entirely sure how NBC's Chuck became such a contentious, controversial series, but after my write-up of last week's episode ("Chuck Versus the Ex") garnered some vociferous responses on both sides (those who loved the episode versus, well, those who didn't), I wanted to be sure to see what everyone thought of this week's episode ("Chuck Versus the Fat Lady"), the second in a three-part storyline that featured the return of Chuck's ex-girlfriend Jill. (You can read my advance review of the entire three-episode story arc here .) While Chuck and Jill grew closer--despite the disapproving glare of Casey and the more-than-slightly jealous shifty glances of Sarah--astute audiences were, of course, waiting for the other shoe to drop. And drop it did in last night's episode in which the team goes on the hunt for a computer file containing the identities of every single Fulcrum agent within the CIA, Chuck betrays Casey and Sarah to save