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.

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.

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

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 practising for the spelling bee that's to be held in the hotel, while Zack's scrounging money to play in the arcade. Cody finds himself competing against someone who's lent Zack money.

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