A high-priority case begins the day Nash plans to take a belated honeymoon with ex-wife Kelly, putting him on the trail of San Francisco's most notorious bookie and renegade FBI officer, #9 on the Most-Wanted List.
Guest starring: Frank Medrano, Cristine Rose, Gareth Williams, Samantha Smith Nash and Joe realize that there is a leak in the prosecution team as they escort a key witness who has joined the Witness Protection Program to San Francisco, while Cassidy decides to go out with J.J. (Stephen Berra) Joe goes undercover inside State Prison to bring down a ruthless Mexican gang leader who put out a hit (from behind bars) on a SFPD undercover cop who had infiltrated the Mexican Mafia.
Guest starring: Angela Dohrmann, Tamara Mark, Brad William Henke, Tom Virtue, Ryan Alosio, with Robert Carradine and Kate Vernon as Whitney Thomas When Cassidy is shot by a stray bullet at school, Nash and Joe hunt down a dealer who has been selling guns to teenagers.
Guest starring: Thomas Wilson Brown, Boti Bliss, Carlos Leon, Max Martini Hot on the trail of a murderous criminal from Chicago, Nash teams up with Karen Decker (Melinda Clarke), a cop from the Windy City who's in every way his equal: smart, competent-and yes, sexy.
Guest starring: Meat Loaf, James Pax, Don Stroud and Tommy Chong as Barry Chen Nash and Joe butt heads with the leader of a team of Urban Commandos who has been hired to protect an inner-city community.
Stacy becomes concerned that Nick is being turned into a lab rat at the university where he has volunteered for a research study A sniper terrorizes San Francisco on Halloween as a city-wide Blue Flu forces our SIU detectives to assume beat cop responsibilities.
Guest starring: Andrew Divoff, Patrick Fischler, Tava Smiley and Kelly Hu as Michelle Chan When a reporter is murdered while covering the new "French Connection", Nash comes face-to-face with a startling revelation – his brother, a Vietnam MIA, thought dead for the last 24 years, may be alive and in San Francisco.
Guest starring: Leslie Hardy, Sharisse Baker-Bernard, Michael Bowen, Anthony Guzman and Daniel Roebuck as Rick Bettina Nash and Joe risk causing an international incident after British consulate workers fake the death of a convicted killer in order to use him for their own nefarious purposes.
Guest starring: Daniel Rosen, Meadow Sisto, Emma Caulfield Ford and Willie Brown Nash is forced to take 10 months and 13 days off under the command of Rick Bettina, who uses his new position to throw the SIU office into chaos.
Guest starring: Russell Means, Suki Kaiser, Christian Meoli as Boz Bishop and Daniel Roebuck as Rick Bettina Nash and Joe team up with a tough-talking NYPD Special Crimes Detective (Penny Marshall) in order to track down a famous fashion model's deadly stalker.
Guest starring: Don Novello, Markus Flanagan, Sean Lawlor and John Apicella Nash and Joe investigate several brutal drug-related gangland murders and follow a complicated trail of clues to a surprising suspect – Bruce Sutcliffe, a multi-millionaire from a well-respected San Francisco family.
Racing against time to capture the criminal mastermind behind this scheme, Nash is surprised to discover that the gang leader is Pamela Smith, a beautiful, brilliant chemist who created the deadly gas.
Guest starring: Meagen Fay, Carlton Wilborn, Pat Skipper, Michael Wiseman, with Kimberly Quinn and Daniel Roebuck as Rick Bettina Nash and Joe are on the trail of a renowned assassin who has come to San Francisco to kill FBI special agent David Katz.
Guest starring: Christian Meoli as Boz Bishop, Kari Whitman, Will Stewart, Paul Popovich, Jim Abele 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.
Guest starring: Sean Whalen, Peter Jason, Buckley Sampson Nash and Joe have to babysit Mickey Tripp (Paul Gleason), a motormouth shockjock, after a body armor-wearing assassin tries to kill him.
Their search for the assassin is compounded by the fact that Nick has hired them on an off-duty case to find his softball team's star pitcher – a Salvadoran defector named Chus (Jose Canseco), who's on the run from the INS.
Guest starring: Paul Gleason as Mickey Tripp, Lisa Darr, Gina La Piana, Peter Jason, Jessica Hopper, and Jose Canseco as Chus Ortez Nash finds himself defending Caitlin when she's the main suspect for a murdered CIA agent connected to her mysterious past.
Nash and company, along with marginal cop Jake Cage (Stone Cold Steve Austin), track down pushers of a deadly steroid which makes body builders go hyper-aggressive.
Guest starring: Bob Koherr, Richard Redlin, Christine Lydon, Pete Koch, Boti Ann Bliss Nash and the SIU secretly investigate a plot involving the missing married Governor of California who has fallen in love with a former prostitute.
Guest starring: Mark Dobies, Julianne Christie, Edward Albert, Dana Gladstone, Sean Moran Nash and company foil a Russian mobster's kidnap plan to fix a hockey game.
Guest starring: Michael Hagerty, with Amanda Foreman, and Cliff De Young When a controversial Latina actress is shot and killed, suspicion turns first to her former lover, then to a crazed stalker.
Guest starring: Leslie Hardy, J.C. Wendel, Nadine Stenovitch and Daniel Roebuck as Rick Bettina A psychologist establishes an insanity defense for her patient while they plan bank robberies.
Guest starring: Harry Van Gorkum, Susan Gibney, Sticky Fingaz, Robin Atkin Downes, Antwon Tanner Nash and the SIU discover the Cell Phone Killer's intentions are to kill his doctor.
Nash pursues an old flame who is involved with an arms dealer; Joe takes a private detective case to discover if a symphony conductor is having an affair; Cassidy struggles to let go of Evan's memory when she is asked out on a date.
Guest starring: Christian J. Meoli as Boz Bishop Nash must track down Rick Bettina, who escapes custody during his parole hearing, and recover the $2.5 million dollars in pension money he stole.
Guest starring: Patrick Fischler Nash is suspicious of a teen's involvement in a brutal ambush that targeted a pair of lawyers, leaving one riddled with bullets and the survivor barely wounded.
Harvey becomes attracted to a fellow "Deadhead," a mysterious woman who is the target of a murderous stalker; Joe is promoted to Lieutenant, but discovers that his new duties mostly involve paperwork; Nick injures his leg and makes life difficult for Nash and Cassidy, who are just trying to take care of him.
Guest starring: Caroline Lagerfelt, Suzanne Krull, Kellita Smith as Regina Adams Cassidy is suspended following her involvement in the fatal shooting of a bystander during a bank robbery and becomes the target of department cronies who want to use her to get rid of Nash.
Guest starring: Suzanne Krull, Ned Vaughn, Claire Yarlett, Matt Gallini, John Haymes Newton A robbery at the Filmore during a concert by Phil Lesh prompts Nash to investigate a soccer coach and his daughter, a stolen motorcycle and a record producer.
Guest starring: Suzanne Krull, Tommy "Tiny" Lister as Mr. Switch, with Christian J. Meoli as Boz Bishop, and Kool Moe Dee as Masta Blasta A serial killer who picks up passengers in a cab and then murders them stalks the city; Cassidy struggles with whether she wants to continue to be a cop.