Five weeks have passed since Colby Granger was exposed as a spy working for the Chinese government and after being captured and imprisoned, Colby escapes and along with friend and fellow spy Dwayne Carter (Shawn Hatosy) race through the city, prompting Don and the team to join the search in hopes of recapturing the two men despite the team still struggling to come to terms with the devastating betrayal but all is not what it seems...Val Kilmer guest stars, while Peter MacNicol returns as a series regular.

When a street race leads to a bad accident in which a man is killed, the FBI find links to a cold case, an unsolved fatal hit-and-run.

Chris Bauer (as recurring character Cal Sci engineering professor Ray Galuski), Michael Welch and GQ guest star.

A Cal Sci Religious Studies professor (Andrea Roth) is brought in to explain the history and the numerology, which Charlie refuses to accept.

A private bank with several suspicious customers is broken into, prompting the team to investigate while David and Colby get their "groove" back as Charlie and Amita discuss her father's reaction to her dating a non-Indian.

Chris Bauer appears as recurring character Cal Sci engineering professor Ray Galuski; Damian Young also guest stars.

The team takes down an inner-city meth lab, and while on the bust they also arrest a bystander who is discovered to have guns and other suspicious items in the back of his van.

Don's old flame AUSA Robin Brooks (Michelle Nolden) returns to California to prosecute an incarcerated criminal kingpin who seems to be ordering assassinations from within the prison.

Zeljko Ivanek and Shawn Doyle guest star Final appearance of: Diane Farr as Megan Reeves NOTE: Refs Need Archive Backup URLs @ https://archive.org/web/