Sheldon and Penny spend quality time together sharing intimate secrets and Wolowitz helps Raj get over his ex-girlfriend.
A deadly hit-and-run involves a driverless car carrying heroin; Tani and Quinn are stuck with a pair of YouTubers who are brought on a ride-along.
When a 15-year-old hacker compromises missions, Callen goes under cover at a prestigious high school.
Zack launches a scheme to salvage the discarded personal items of a popular singer (Jesse McCartney).
Cody is graduating top of the class, but Zack has done badly and must attend summer school.