Tricia Helfer guest stars as agent Alex Forrest, assigned to evaluate Sarah's performance due to General Beckman's concerns about her relationship with Chuck.

It's Morgan, Jeff and Lester, who are rehearsing kidnapping Devon for his bachelor party, and Chuck reminds them they're not invited.

The team is assigned to investigate a suspected Afghan terrorist, Rashad Ahmad, receiving heart surgery in the U.S., as he is a link to their leader Hassan Khalid's whereabouts in the cavernous region on the border of Afghanistan and Pakistan.

While Chuck delays them, Casey attempts but fails to break into the hospital's donor bank, where he intends to plant a GLG-4000 bug in the pacemaker that will be implanted into Ahmad, which they can use to track him even in the mountainous regions of Afghanistan.

Forrest disguises herself as a stripper with a police officer routine at the party and takes Devon into the Buy More Home Theater room.

After a debriefing by Beckman, Forrest tells her that Sarah's performance is compromised by her personal feelings for Chuck.

Meanwhile, Zamir discovers a bug planted during Ahmad's surgery and targets Devon as the surgeon who implanted the device.

While Sarah is on the road, her search of Stephen Bartowski concludes, and she decides to return immediately to Burbank to tell Chuck what she has found.

The three track them to a bank vault, which Zamir is using to shield the bug while forcing Chuck (whom he believes is Devon) to operate and remove it.

Later in a debriefing, Beckman reluctantly admits that Chuck and Sarah's feelings for each other make them more effective together, rather than acting as a liability.

Agent Forrest arrives later disguised as a dancer herself and performs a strip tease for Awesome, handcuffing him and taking him to the Home Theater Room where she attempts to seduce him.

Devon later inadvertently triggers the briefing himself when he jokingly uses the name "Carmichael," but doesn't see Beckman before she shuts it down.

To help make it up to him, Sarah reveals she's learned where Chuck's father is hiding and takes him out to a trailer 100 miles outside Barstow, California.

Helfer greatly enjoyed her time on the show, complimenting the series' and cast's sense of humor.

Scott Bakula appeared as Stephen Bartowski beginning with the next episode, "Chuck Versus the Dream Job" as part of a three-part story arc alongside Chevy Chase.

[4] Ryan McPartlin has said in interviews that Devon will be becoming more involved with the series as it moves towards the finale, and will be growing suspicious of Chuck's double life.