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 that he is being framed for his informant's murder.
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.
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 tries to help a schizophrenic, the sister of his high-school girlfriend (Bebe Neuwirth).
On the date of a criminal's execution, the man's brother kidnaps Olshansky for revenge.
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 tries to track down a fare who left behind an envelope containing $10,000.
Olshansky helps a man get his wedding ring back from a prostitute who robbed him.
Olshansky searches for the identity of a homeless man who died in the back of his cab.
Olshansky discovers that Marcellus is being blackmailed into framing a bookie for gun trafficking.
Cash-starved Olshansky accepts a loan shark's offer to be his personal driver.
Trying to help a young drug addict get clean, Olshansky contends with a drug dealer.
Olshansky protects a man from his former business partner, freshly out on parole.
Olshansky helps a woman who says her husband, a police officer, is abusing her.
Olshansky and Marcellus team up to search for a teen accused of murder.
A cabdriver (David Morse) taps contacts from his former career as a police officer in order to help people in need.