S4E1 - Silk
A young woman leads O'Brien and Giambone (Scott Hylands, Jeff Wincott) to a hit man who plans to assassinate the deputy mayor.
Jan. 14, 1988, midnight
S4E2 - Chinatown
Giambone and O'Brien are assigned to investigate several murders after Kirkwood's friend gets involved with the Chinese underworld.
Jan. 21, 1988, midnight
S4E3 - Ain't No Cure for Love
When a junkie who attempts to rob the bar is killed by an irate patron, Nicole hides the real facts from O'Brien.
Feb. 4, 1988, midnight
S4E4 - Woof
Vociferous animal rights activists raid a research laboratory and steal monkeys to use in a propaganda campaign.
Feb. 11, 1988, midnight
S4E5 - Whitey's Run
Whitey and his girlfriend become mob targets after he witnesses a murder during his pickup of stolen merchandise. Whitey and his girlfriend are forced to enter the witness protection program.
Feb. 18, 1988, midnight
S4E6 - Blowing Bubbles
O'Brien (Scott Hylands) must re-evaluate his relationship with Nicole (Susan Hogan) when she becomes pregnant. Guest star: Elias Zarou. In addition, O'Brien and Giambone investigate a gruesome assault tied to a crooked restaurant owner who is indebted to a dying loanshark. With Jeff Wincott.
Feb. 25, 1988, midnight
S4E7 - None Shall Sleep
When Lt. Hogan is shot during a holdup, O'Brien and Giambone must rally behind the unfamiliar lead of a beautiful temporary commander to catch the assailants.
April 21, 1988, midnight
S4E8 - Forgive Me Father
A young woman confesses to Father Torres that she witnessed her brother kill a friend over a disagreement during a mugging.
April 28, 1988, midnight
S4E9 - Better Part of Valor
Carson (Stephen Mendel) feels responsible when Colby (Eugene A. Clark) is shot while investigating a robbery. With Scott Hylands and Jeff Wincott.
May 5, 1988, midnight
S4E10 - The Privilege of Freedom
O'Brien and Giambone investigate the deaths of six illegal aliens who died in a shipping container trying to enter the country. Both are convinced another 'shipment' is on the way.
May 12, 1988, midnight
S4E11 - Set for Life
While investigating an unusual death, Kevin and Frank become curious about a wealthy family's effort to keep their dead father's memory alive. Frank is pursued by payroll because of his mounting debt.
May 19, 1988, midnight
S4E12 - Bogota Blues
A Columbian detective helps the precinct apprehend members of a drug ring when several people are killed by a lone gunman during a cocaine operation.
Sept. 22, 1988, midnight
S4E13 - Bless Me Father
A priest helps the police find the hit-and-run driver who killed a young woman. Meanwhile, a women visits Lt. Hogan and claims to be his daughter.
Sept. 29, 1988, midnight
S4E14 - The Mercenary
Kevin and Frank investigate when a real estate fraud sends a psychopath on a killing spree.
Oct. 6, 1988, midnight
S4E15 - False Witness
A man attempts to protect his wife after she witnesses the murder of a drug dealer.
Oct. 13, 1988, midnight
S4E16 - Archie's Riff
O'Brien and Giambone (Scott Hylands, Jeff Wincott) investigate when members of a jazz band are killed one by one. Guest stars: Paul Benjamin, James Purcell.
Oct. 20, 1988, midnight
S4E17 - Goodbodies
O'Brien and Giambone investigate the murder of a health club co-owner and confront a powerful loan shark.
Oct. 27, 1988, midnight
S4E18 - Ice
After a jewelry robbery goes awry and an injury inhibits O'Brien, the prime suspect fabricates charges against Giambone.
Nov. 3, 1988, midnight
S4E19 - Jumper
O'Brien is consumed with guilt when he fails to prevent a suicide; Giambone pursues murderous thieves.
Nov. 10, 1988, midnight
S4E20 - The Professional
O'Brien and Giambone (Scott Hylands, Jeff Wincott) must prevent the assassination of an Italian organized crime prosecutor (Hrant Alianak).
Nov. 17, 1988, midnight
S4E21 - The Wrong Woman
A police academy classmate of Giambone (Jeff Wincott) is investigated by a review board. Guest stars: Frank Pellegrino, Barbara Barnes-Hopkins. With Scott Hylands.
Nov. 24, 1988, midnight
S4E22 - No Regrets
O'Brien and Giambone (Scott Hylands, Jeff Wincott) become involved when Nicole's (Susan Hogan) mother (Frances Hyland) is attacked by a group of skinheads.
Dec. 1, 1988, midnight
S4E23 - Elaine
Elaine (Deborah Grover) reluctantly becomes a decoy for a serial killer. With Scott Hylands and Jeff Wincott.
Dec. 29, 1988, midnight
S4E24 - Blues in a Bottle
The officers of Mid-South are reminiscing about their time together. After working together for years they now face the possibility of being sent to different precincts. Kirkwood proposes a feature article to raise awareness and prevent the closure.
Jan. 5, 1989, midnight