Responding to a call, Gibbs and company find the body of a Marine major in an underground utility vault beneath a street intersection. Abby finds the cause of the death, and she finds that the killer watched the death from a bowling alley, so Gibbs, Tony, McGee, and Ziva go to the bowling alley, where they meet a bunch of people. McGee learns that 10 kilos of a deadly gas are missing; Sharif, the bomber from the golf course, calls Gibbs about the gas. Gibbs and Hollis confer; Ziva likes a guy and gives him some data, then he winds up in Gibbs's chat room. Gibbs and the gang find out about the major, then they pursue Sharif; Gibbs finds him, but Gibbs needs and receives help.
—DocRushing