After seeing Sandburg's thesis, the media exposes Ellison's powers, greatly jeopardizing the safety of a union leader facing death threats.
Ellison pursues one of the Federal Bureau of Investigation's most-wanted criminals -- a bank robber and alleged cop killer.
An actor (guest star Robert Vaughn) who once played a detective tries to help Ellison (Richard Burgi) catch a killer.
Sandburg and Ellison look for a connection between an abandoned corpse and the restless ghost of a woman murdered 45 years earlier.
Ellison (Richard Burgi) may take the fall for a murderer after he becomes entangled with a femme fatale.
A fanatical militia takes over at a nationally televised basketball game, and Sandburg and Banks end up in a hostage situation.
Sandburg is shocked when it's revealed that two of his students are linked to Ellison's murder mystery.
Ellison discovers another aspect of his powers after Sandburg's death and follows the evil Sentinel to the jungles of Peru.
Sandburg meets Alexis Barnes and encourages the female Sentinel to refine her abilities, but she soon misuses her skills.
Ellison and Sandburg go after a jury-tampering lawyer; Sandburg's doctoral dissertation irks Ellison.
Posing as a married couple, Ellison and Megan must identify an endangered witness in order to save the woman from her ex-husband, a junk-bonds dealer.
Ellison reluctantly works with Australian police detective to thwart a robber's plan to hit a federal mint.
A money heist, phony military officers and a train bound for nowhere thwart Ellison's peaceful fishing getaway in a remote town.
While investigating a monk's murder in Chinatown, Ellison finds himself the target of a professional killer who is an old flame.
Ellison learns he's had sentinel abilities since childhood, but suppressed them due to a traumatic experience.
A jealous brother (guest star Karim Prince) is the prime suspect in the shooting death of a boxing champion (guest star Roy Jones Jr.). With Richard Burgi and Garett Maggart.
Ellison and Sandburg help the substitute chief bust a drug lord; recuperating Capt. Banks overhears doctors plotting a murder.
Ellison and Sandburg (Richard Burgi, Garett Maggart) must figure out how an imprisoned serial killer has apparently murdered again.
Ellison and Sandburg try to save the life of a murder witness who claims she was in a trance during the killing.
Ellison becomes an inmate in hope of avenging the death of his friend, a model prisoner who was killed trying to escape.
Greed leads to murder at an archaeological dig where a treasure map is supposed to lead to precious antiquities.
Ellison (Richard Burgi) investigates a plastic-surgery lab that helps criminals forge new identities.
Ellison investigates the connection between several murders, a cache of smuggled diamonds and a former KGB agent.
Ellison and Sandburg encounter a bad storm and a woman with ties to a drug czar during a visit to a remote island.
A murder investigation puts Ellison and Sandburg in the middle of a plot to assassinate a peace activist from a tyrannical nation.
Ellison (Richard Burgi) becomes the target of a crazed computer hacker (guest star Cameron Dye) after a traffic encounter.
Working as a bodyguard for a crime family, Ellison tries to help a woman and her young son escape from the life of the mob.
The detectives work with game wardens to find a ring of illegal poachers who sell endangered species to rich clients.
Sandburg becomes infatuated with his female neighbor until he learns of her involvement in a drug trafficking ring.
On the eve of a playoff game, a young man's death may be linked to a feud between professional basketball players.
Ellison learns that members of the Chopec have come to avenge Cyclops Oil's illegal operations on land in Peru.
Ellison opens a murder investigation when a woman awakes from a coma and sheds new light on a deadly accident.
The pressure is on the department to solve two gruesome murders that occur within a week at Cascade's new racetrack.
Ellison and Sandburg set out to find cop killer Dawson Quinn after he escapes with Capt. Banks during his extradition.
Ellison suspects a setup when an armored car spills its payload onto the streets of a poor neighborhood and millions vanish.
Ellison collides with an FBI agent when his investigation reveals that a missing mob informant-turned-fugitive is alive.
A kidnapped girl's parents hire a celebrity psychic to help Ellison with his search for the kidnappers.
A 14-year-old genius complicates Ellison's already challenging investigation into the bizarre death of a maintenance man.
Ellison and Sandburg pursue Russian mobsters who are blackmailing a desperate immigrant family into smuggling plutonium into the area.
Terrorists seeking ransom suspend Sandburg and group of hostages in a high-rise elevator; guest Clarence Clemons.
A former military intelligence officer who runs a drug-smuggling operation kidnaps Ellison; guest Steven Ford.
Ellison partners with a beautiful, no-nonsense arson inspector to investigate a string of warehouse blazes.
Ellison tries to hide his secret abilities from his Internal Affairs nemesis when they join forces to bring several drug dealers to justice.
When Ellison investigates the influx of a designer drug his contact with the substance leaves him temporarily blind.
Ellison and Banks investigate several African-American church bombings that could be racially or politically motivated.
A Chilean druglord's enemies kidnap his daughter while she is in Ellison and Sandburg's protective care.
Sandburg's mother (Leigh Taylor-Young) gets caught up in a trap Ellison has set to catch violent car-jackers.
Ellison and Sandburg pursue an elusive killer on an offshore oil rig after the murder of a platform worker.
Ellison develops feelings for a young graduate student who works as a prostitute running an international extortion scheme.
A pushy camera crew hinders Ellison's pursuit of bank robbers when they film a day in the life of the detective.
When gang war erupts, Ellison's efforts to negotiate a truce are dependent on an attorney who is actually an undercover FBI agent.
A former girlfriend (Sydney Walsh) of Capt. Banks (Bruce A. Young) is found dead, apparently shot with Banks' own gun. With Richard Burgi and Garett Maggart.
Ellison becomes a suspect in a murder-for-hire case involving a kidnapping and his former partner who disappeared along with the ransom money.
Ellison is frustrated by the uncooperativeness of the popular singer he is safeguarding from an obsessed fan.
Ellison's special abilities disappear while searching for a missing Capt. Banks in the Peruvian jungle.
Sandburg and Ellison (Garett Maggart, Richard Burgi) become suspects when a monk is found murdered during their weekend retreat at a secluded monastery.
Ellison's strange attraction to a beautiful woman during a jewel-heist case leads Sandburg (Garett Maggart) to identify the diamond thief.
Sandburg (Garett Maggart) jeopardizes Ellison's investigation of an international weapons cartel when he falls in love with the daughter of the cartel leader.
An urban terrorist threatens to release a canister of Ebola virus unless Ellison (Richard Burgi) helps him steal an Air Force reconnaissance plane.
Flu-stricken Ellison (Richard Burgi) suffers adverse effects from medicine while escorting a police informant via train to the witness protection program.
Sandburg becomes a serial killer's next target after he accidentally tips off the suspect, allowing him to escape.
The investigation of murders at a gang-connected drug lab leads Ellison (Richard Burgi) to a corrupt cop.
Ellison's seemingly impossible identification of a police officer's killer prompts charges of manufacturing evidence.
Sandburg (Garett Maggart) becomes a hostage when a paramilitary group takes over the central police department.
An anthropologist (Garett Maggart) teaches a police detective (Richard Burgi) how to use his heightened senses to fight crime.