When Olshansky faces assault charges, he is convinced that a former enemy recently released from prison is trying to frame him for revenge.
Olshansky agrees to help find a missing man who has an inoperable brain tumor, but he soon learns the man's wife (Jane Krakowski) is having an affair with her husband's physician.
Olshansky searches for a stripper who left her cell phone in his cab, believing she may be in trouble; Marcellus helps his former mentor cope with the fact that his grandson is a criminal.
Olshansky helps a mother track down her illegally adopted child; Marcellus obsessively monitors Deborah's relationship with a new man.
Olshansky learns of his cousin's post-war trauma, addiction to painkillers and marital troubles while trying to talk him out of committing suicide.
Jamie and his buddy are beaten in what appears to be a gay-bashing incident, then Olshansky tries to find the thugs responsible with minimal support from local authorities.
Olshansky is slapped with a wrongful death suit after accidentally killing a mugger.
A mobster kidnaps Mike Jr. and threatens to kill him unless Olshansky comes through on a deal.
When Marcellus examines the body of a woman who has been raped and murdered, he finds Olshansky's telephone number written on the palm of her hand.
Mike devises a plan to save Jamie's childhood friend from a life of prostitution; Marcellus attempts to help a boy who is forced to work for a dangerous loan shark.
Olshansky and Marcellus assist a woman on the run from a murderous small-town police officer (Robert Pastorelli).
Jamie must face his father's extramarital affair, which takes a deadly turn when the mistress is found dead.
Olshansky becomes smitten with an amnesiac (Kelli Williams) who is being hunted down by a professional assassin.
Olshansky unwittingly inspires a woman to hunt down and kill one of the thugs who attacked her; Marcellus reaches out to a drug dealer's son.
Olshansky must determine who wants Marcellus dead after his friend narrowly escapes two assassination attempts.
Olshansky comes to the aid of a man whose life is ruined even after he is acquitted of a rich woman's murder.
Olshansky and Marcellus try to help a young black man who has been erroneously arrested by the FBI for a deadly bombing at a criminal-justice center.
Olshansky attempts to protect a young man from corrupt DEA agents who want him dead for being the only witness to their multiple homicides.
Marcellus tries to convince Olshansky he is being framed for murder; Olshansky comes to believe he will be given a jail sentence.
As his trial nears, Olshansky begins to investigate allegations that Marcellus is a corrupt police officer.
Olshansky continues to care for his demeaning father who is dying; the bishop suspends Grizz after money disappears from the church's coffers.
When a recent murder is very similar to an old one, Olshansky fears he got the wrong person convicted years ago.
Olshansky gets Heather fired from the hospital when he tries to help her expose a doctor's fatal mistake.
A recent parolee informs Olshansky that the police have arrested the wrong man in a murder investigation.
Olshansky reconnects with a high-school girlfriend while trying to help her sister, a homeless schizophrenic who claims someone is trying to kill her.
A revenge-minded man kidnaps Olshansky intending to kill him at the same moment his brother is executed.
An Internal Affairs officer offers Olshansky a deal to get Marcellus; a high-school friend looking for counseling approaches Grizz.
A passenger, the father of Mike Jr.'s friend, exits Olshansky's cab, then is killed by a hit-and-run driver.
Olshansky helps an employee of the Justice Department whose sister has been kidnapped by someone looking for a man in the Witness Protection Program.
Olshansky agrees to protect a woman from a man she says has been stalking her, but Marcellus doubts her story.
Olshansky spends a long and frustrating night trying to track down a fare who left behind $10,000 in cash in his cab -- and it wasn't a tip.
After picking up a nearly naked man, Olshansky agrees to help him get his wedding ring back from a prostitute who stole his clothes and wallet.
Olshansky spends Thanksgiving Day searching for the identity of a homeless man who died in the back of his cab. John Heard guest stars in dual roles.
Olshansky is shocked to discover that a crime king is blackmailing Marcellus into framing a bookie for gun trafficking.
Strapped for cash, Olshansky reluctantly accepts a rich loan shark's offer to become his personal driver.
Olshansky contends with a drug dealer out for blood when trying to help a 19-year-old addict get clean.
Olshansky's weekend plans with his son are ruined when he tries to protect a man from his former business partner.
Olshansky hides a mother and her daughter who claims her policeman husband is abusing her, but he's not sure if she's telling the truth. Abigail Breslin guest stars.
Olshansky agrees to help Marcellus search for a young murder suspect in exchange for Marcellus' help finding his stolen cab. Fisher Stevens and David Patrick Kelly guest star.
A cabdriver (David Morse) taps contacts from his former career as a police officer in order to help people in need.