After a private jet's passengers and crew travelling from New Orleans to Washington, D.C., are lethally poisoned, all evidence points to the missing chef, Abby's brother, Luca. Gibbs and the team work in conjunction with Pride and the New Orleans team.
A computer hacker called Neo learns that his entire reality is merely a computer-created illusion. In reality, humans are living batteries used by the machine armies that have taken over the world. Neo is the only person who can save humanity.
When Team Scorpion travels to Ireland for Megan's one-year memorial, Walter discovers that a nearby lake's natural disaster has created a poisonous cloud. Also, Cabe and Toby try to alleviate the tension between Tim and Walter.