Sophie Oda

Sheldon and Penny bond in Leonard's absence, and Koothrappali finds someone to share his heartache with. Elsewhere, while away at an out of town conference, Bernadette and Amy are hit on at the hotel bar.

Callen goes undercover at a prestigious high school to track down a teenaged hacker who is compromising missions.

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.

Zack launches a scheme to salvage the discarded personal items of a popular singer (Jesse McCartney).

Cody gets the job as editor of the school newspaper and appoints Zack as agony aunt. He proves very popular until he abuses his role by advising a girl he likes to go out with him.

Cody is graduating top of the class from 8th grade, but Zack's done badly and must attend summer school - a fact he tries to hide from his parents.