Bryce McBratnie

Sheldon and Dr Sturgis have their first argument when Dr Sturgis marks an answer wrong on Sheldon's test; Mary fills in for Pastor Jeff when he falls ill.

The lead suspect in a murder investigation is a woman that Gibbs' friend, Phillip Brooks, met on a dating site; Sloane has a secret admirer on Valentine's Day.

The parents are asked to form carpools when the bus drivers go on strike, and Axl studies astronomy to impress a girl.

The team land a big case involving a Syrian terrorist after the Undersecretary of Defence takes over from Hetty and Granger.

The team goes up against the Mob when a former boss is killed, while Junior's friend is on the run after witnessing the murder.