"Chuck Versus the Helicopter" is the second episode of the television series Chuck. It aired on October 1, 2007. Chuck is meeting with a government specialist connected with developing the Intersect to determine if the secrets can be removed from Chuck's head, but suddenly finds himself unsure which of his handlers to trust.

The episode begins with Chuck offering the viewers a recap of the events that have put him in his current position, while helping Casey chase down a shoplifter. As part of their covers, Casey is now working at the Buy More as a "Green Shirt," while Sarah poses as his girlfriend and working at the "Wienerlicious" across the parking lot from the Buy More. After helping Casey apprehend the shoplifter (and ensuring Casey doesn't beat the kid) Sarah reassures Chuck there is a plan to remove the secrets from his head. The two plan a second "date" that night to discuss it. Later while getting ready, Ellie complains that Morgan has met Sarah, but she has not, so plans dinner for them all the following evening.

The team meets with the specialist, Dr. Jonas Zarnow, at the Buy More. Chuck is confined to the Home Theater room. Sarah explains that this is for both Chuck and Zarnow's safety and Chuck is referred to as "Patient X". Zarnow administers his tests from outside and confirms Chuck's possession of the Intersect data. He also states he believes he can help them remove the data and allow Chuck to return to his normal life. Sarah delivers the news after dropping off Chuck at home, although Chuck is disappointed because it means he won't see Sarah again. Unknown to either of them, Zarnow's car explodes on a remote road after departing.

Chuck goes to work the next morning while Casey and Sarah investigate the site of the bombing. Casey is suspicious of Sarah, who finds Zarnow's phone and secretly pockets it, and he reports to Beckman that the explosion looks like a CIA job. Back at the store, Casey warns Chuck not to trust Sarah. He ditches Casey with Morgan during a training session and sees her anyway. Sarah shows him the phone and Chuck flashes, identifying it as an NSA Incinerator. She in turn warns him not to trust Casey. When Chuck returns from his meeting Casey confronts Sarah at the Wienerlicious and the two fight, but are interrupted by patrons and Casey escapes. Chuck is called away from the store for a Linux install but the job was a fake called in by Casey.

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