Blair and Jim, along with forensics specialist Carolyn Plummer, suspect that a series of seemingly unrelated murders are actually the work of a serial killer.

Blair forces Jim to take a vacation at a remote monastery. Initially reluctant, Ellison begins to enjoy the solitude until one of the monks is found dead.

While guest-lecturing in Blair's anthropology class, Jim saves the entire building from a deadly gas leak only to discover that the leak was designed to distract the campus' attention while a canister of the Ebola virus was being stolen from the hazardous materials lab.

An arsonist burns down a furniture warehouse, and Ellison rescues an unconscious guard from the building.

During a flight to South America, Captain Banks and his son Daryl crash land in the Peruvian jungle and eventually stumble across a shady lumbering operation run by a man named Reischer.

When employees start dying "accidentally" aboard the North Star Five oilrig, Jim and Blair discover that their newest assignment has them walking a decidedly watery beat.

The town of Cascade is brought to its knees when Garrett Kincaid, a notorious criminal that Jim Ellison had arrested years before, seizes control of the town's police station with the help of his gang of felons.

When Blair unknowingly moves into an apartment next to the drug lab of a local gang (dubbed the 357), Jim suddenly finds himself embroiled in the beginnings of an all-out gang war.

Ellison gets his fifteen minutes of fame when the police department invites TV producer Wendy Hawthorne and Conner, her cameraman, to do a piece on him for her show "True Crime."

Sandburg becomes trapped between floors in a skyscraper elevator controlled by an extortionist, who threatens to send the elevator plummeting to its doom unless a hefty ransom is paid.

When Blair and Jim join Captain Banks at his 20-year high school reunion they discover more than just nostalgia awaiting them in the officer's hometown.

Ellison finds himself witness to the beginnings of an underworld war between the drug-running bikers of The Void and the local representatives of the deadly Japanese Yakuza.

Ellison and Sandburg get a chance to hone their driving skills when some high-end car thieves set up shop on the streets of Cascade.

After witnessing the death of undercover officer Danny Choi at the hands of a sniper named Tommy Juno, Jim uses his enhanced vision to identify and apprehend the killer. But the case against Juno is thrown out of court when its decided that no human could possibly have seen as far as Ellison had claimed.

Ellison and Sandburg are called in to investigate an attack on a prostitute named Amber Larkin.

Jim and Blair are assigned to escort Derek Wilson, a key witness in a local homicide case, on his train ride from Oregon to the courthouse in Cascade. Wilson has essential information that will link his employer to charges of arson and murder.

Ellison receives a phone call from old Army buddy Sam Holland, who asks for help.

Ellison sees an undercover police detective named Brent Marten thrown to his death from a police helicopter. Ellison watches Banks and his men retrieve the body from the harbor, then learns the case has been placed under the jurisdiction of Internal Affairs investigator Sheila Irwin.

Jim's sentinel abilities detect something strange at the crime scenes of all the recent jewelry robberies but he's unable to figure out exactly what's causing the reaction.

When a series of explosions level black churches throughout Cascade, Ellison, Sandburg and Captain Banks uncover the racist influences of the White Aryan Resistance (WAR) in their city.

Professional thief Harry wants to see his daughter and grandson one last time, but his position on the FBI's Most Wanted list makes that difficult - especially when another thief is using his MO and has killed two cops during a job.

While Captain Banks, Blair, and Jim are fishing together they stumble across a poaching ring that's hooked up with a powerful Chinese gangster named Ho Ng.

When a local Santeria ceremony goes wrong, one man is dead and the only witness is a woman who was deep in a religious trance while she unknowingly watched the murder. Ellison and Sandburg need to enter into Cascade's Little Havana community in order to uncover the killer.

A present day murder leads to a revelation that may be able to finally clear up a 45 year old murder, and vindicate the victim and the boy (now a troubled, haunted man) who saw it happen. And Jim discovers a new ability.

Poet Dimitri Gordienski is killed by a sniper at Cascade's Russian Arts Festival. Captain Banks wants the case resolved quickly before the federal government gets involved.

Blair, Banks, and Megan may be Jim's only hope of overcoming the superhuman stalemate and returning Cascade to a one sentinel town.

During a local Amnesty International conference, Ellison and Sandburg are assigned to watch over Genevieve Benet, the outspoken St. Germainian peace activist.

When a dead body falls out of the sky with every bone broken, every organ shattered, and no identification, Ellison and Sandburg know that they are not dealing with an ordinary criminal.

Jim's friend Roger Corman, a U.S. Marshall, is killed in a car bombing before he can reveal the name of a corrupt marshall that he's uncovered. Ellison must ferret out the traitor but finds his hands tied when the U.S. Marshalls themselves take over the investigation.

Blair falls for Jim's new neighbor; a beautiful woman named Iris, but learns that this particular girl next door isn't as innocent as she appears. Iris and her ex-boyfriend Chance haven't exactly been living the American dream and the smitten Sandburg is quickly sucked into this couple's twisted nightmare.

A construction foreman is murdered at a racetrack under renovation, and his body is hidden in a pillar. Weeks later, Banks attends the opening of the racetrack with friends, and Ellison attends a police benefit at the track's turf club. During the benefit event, one of Banks' friends is pushed from the roof, and falls to his death in what looks to the partygoers to be a suicide.

Using his sentinel powers, Jim saves Edward, the grandson of Mafia don Dominick Lazar, from drowning. When Don Dominick himself thanks Jim for his efforts, he decides to use this opportunity to get on the inside of the city's organized crime world.

When a car comes barreling into the Cascade Police Station in the middle of the night, the Sentinel team finds themselves abruptly thrown into a murder investigation. Initially, their only witnesses are shaken-up but, when an alligator gets loose in the station, everyone goes crazy.

During the search for a kidnapped little girl, the skeptical Ellison and Sandburg receive help from Charlie Spring, a "psychic."

Ellison and Sandburg spot a man, a mob accountant, who they thought was dead. When they try to catch up to him, he nearly runs them over escaping in his car.

Jim Ellison can't explain how Warren Chapel, a permanent patient at a maximum-security mental institution, has detailed firsthand knowledge of a string of grisly murders occurring around Cascade.

In the Peruvian jungle, a Chopec Sentinel named Incacha is enraged by the pollution of his land by a contaminated oil well and the murder of one of his tribesman by an employee of the Cyclops Oil Co. ... Back in Cascade, Ellison foils a burglary but accidentally shoots a security guard. Luckily, the guard is OK, but Ellison's dismay causes his Sentinel powers to disappear.

After a minor car accident and heated argument with the driver, Dan Freeman, Jim Ellison finds that this unbalanced man has targeted him for a full-blown vendetta.

Professor Robert McCain, the Rainier University expert in serial killers, turns up dead and Ellison is forced to re-open a case that dates back to his youth. As a 10-year-old Jim discovered the last known victim of the infamous Country Club Strangler and it's haunted him ever since.

When the federal mint is targeted for a major heist, Ellison and Sandburg are joined by Megan Conner, a visiting police officer from Australia, as they prepare to apprehend the robbers in the act.