Nash tries to recapture three escaped convicts, but undercover cop Jake Cage also wants the cons and wants Nash off the case; Cassidy has second thoughts about marrying Evan; Harvey threatens to take Anna to court to find out whether he fathered her son.

The SIU is disbanded by MCD: Nash and Joe are assigned to Park Detail, Harvey to Homicide, Evan to Traffic, and Caitlin to Vice. Still, Nash manages to solve a murder involving the Head of MCD's daughter and a drug dealer. Evan and Cassidy announce a wedding date.

Nash and company discover a gang of female bank robbers who plan to break their husbands out of jail. Nick schemes to move into a formerly all woman retirement home. Caitlin readies her negative report on the SIU, much to Nash's consternation.

An ex-cop Caitlin indicted gets out of prison and terrorizes her. Harvey has an affair with a woman he met undercover. Joe has urgent sex with ovulating Inger.

Nash and company foil a Russian mobster's kidnap plan to fix a hockey game. Inger wants another baby; Evan blows a hole in the roof of the Watch Commander's car.

Nash and the SIU must re-open a serial killer's case file when a body is discovered and it appears to be Angel's. Bonnie, Harvey's ex-wife, returns with an interesting proposition. Joe and Caitlin square off as rival soccer coaches when their teams enter the playoffs.

A sleep deprived Nash must track down an ingenious bomber targeting a corporation he feels has wronged him. Cassidy tries to conceal her nudity in a school play.

The Governor is missing, and Nash and Joe lead the "off the record" investigation into his disappearance. Caitlin, shut out, is determined to find out what he's up to. Joe and Inger attend a charity auction as a man's proxy to get on his good side, but overpay and get stuck with the art project.

An undercover police officer joins forces with Nash to put a choke hold on marauding bodybuilders who are pumped up on illegal steroids. Cassidy is haunted by the death of her friend from the auto accident.

Nash must stop a sniper terrorizing the city by shooting victims at random. A rat infestation forces Joe to confront his "landlord", Nash, about the problem. Evan proposes to Cassidy, but in the wake of a serious traffic accident, Cassidy is left fighting for her life.

Nash and company stop a vampire cult from kidnapping a singer for her special blood. Joe goes shopping for a car for wife Inger at the police auction, while Caitlin moves out of the SIU.

An ex-60's radical uses runaway kids to commit a rash of crimes. Joe goes undercover as a shoe salesman to clear Maria of shoplifting charges. Caitlin accompanies Nash to a ritzy ball.

Nash is accidentally shot in the butt by Caitlin, leaving Rick Bettina in charge. Rick is duped by phony FBI agents attempting to swindle half a million in sting money. Cassidy is stalked by a violent classmate.

Nash finds himself defending Caitlin when she's the main suspect for a murdered CIA agent connected to her mysterious past. Joe begins working out with the trainer from hell. Cassidy and Nick enter a tango dance contest.

Nash and Joe attempt to prevent a zealous INS agent from deporting a baseball star who is in the country illegally, and a shock jock from an assassin. Caitlin babysits her roommate's kids.

Nash pursues a deadly arsonist who torches a church and the only witness is Angel. Caitlin investigates Evan on a police brutality charge, probing into his past. Nash's friends and family plan a surprise birthday for him.

Nash becomes the objective of mercenaries controlled by a Singapore billionaire and his American counterpart, locked in battle to capture each other's most prized possessions. Bettina wants Joe and Evan to investigate his fiancée's alleged affair.

Nash and Caitlin go undercover as swingers to bust a couple who prey on wealthy swinging couples. Joe and Boz help Nick recover the corpse of an old friend to whom Nick made a war time promise.

Nash and Joe are on the trail of a renowned assassin who has come to San Francisco to kill FBI special agent David Katz. Lisa Bridges returns from Paris and announces she's engaged to marry a famous French chef named Henri, but there's a problem; Nash and Lisa's divorce was never finalized. The new S.I.U. headquarters is introduced.

Nash and Joe are arrested for the murder of three SFPD Investigators. Told in a non-linear style, we slowly unravel a conspiracy trying to frame Nash and Joe.

Nash has 14 hours to find out if a man set to be executed is innocent. Lucia is expelled from school for fighting and Joe's attempts to reach out to the other student's father result in violence, a threatened lawsuit, and a smashed trophy.

Nash and Joe search for a psychopath who telecasts videotapes of his crimes on the Internet; Joe considers suing a restaurant.

Nash and Joe are the targets of a bail bondsman, who bails out small time thugs and uses them as assassins. Nash and Joe also open up a new detective agency: Bridges & Dominguez. Their first case is finding the stolen wig of a Cher impersonator. Harvey and Evan's friendship is tested when Evan sells Harvey a faulty washing machine.

Nash discovers his life savings is gone when his accountant invests in a deal cooked up by "Bombshell" Tamara Van Zant. While trying to remodel the bathroom himself, Joe burns down his house and takes Nash up on his offer to move into Lisa's. Nick decides to take scuba lessons.