Officer Malloy pays tribute to Officer Tom Porter, who has recently fallen in the line of duty. Malloy recounts the close friendship they developed while training at the academy, as well as the moments where they crossed paths on duty, including the night of the officer's unfortunate demise.

While on a quiet patrol, Reed decides to spend part of his lunch break doing business at his bank while Malloy waits in the patrol car. Unfortunately, he walks into the clutches of a pair of ruthless robbers who take him hostage.

It's been a long night of patrol for Malloy and Reed. Just as the two tired officers are headed to the station to turn in for the night, shots are fired at the patrol car. In the blink of an eye, Reed kills whom he believes was the gunman. Back at the station, Reed undergoes a night of intensive questioning from the captain and lieutenant, as part of the superior officers' investigation into the incident. In the end, the captain confides in Reed that his story is credible and the rookie officer will likely be allowed back on patrol upon the completion of the investigation.

Malloy has to shoot one of two robbery suspects, then the officers counsel a young woman in a bad neighborhood not to hang around (she is later kidnapped by two men claiming to fix her car), the LAPD's Air-Ten helicopter is used to catch the kidnappers (who already had outstanding kidnapping warrants), find a "mover" (burglar) whose partner hides in a freezer, and the officers visit an apartment on a domestic dispute complaint and find another woman with severe injuries but the couple insists nothing is going on, later arresting the husband on domestic violence charges after the woman's mother calls the police back to the apartment after the woman's husband beats their daughter.

Malloy celebrates his birthday by having to let Reed drive 1-Adam-12 (due to Malloy allowing his driver's license to expire) and is nervous about his young partner driving the car. Calls include a bank robbery reported by the Bank robber, a burglary involving several neighbors, an abandoned baby, a suicidal wife who killed her husband on their 22nd wedding anniversary, and a drug dealer selling his wares out of an ice cream truck.

Reed spends an evening on the firing range, then stops by an all-night grocery store. When Reed leaves, a man approaches him as if he knew him, then points out another man in a green Beetle holding a gun on the officer. Reed drops his groceries, shoves the man, jumps and fires at the Beetle driver, hitting the car, but the man in the Beetle shoots his accomplice. The grocer swears he only heard one shot, and the accomplice gives a dying declaration that Reed was trigger-happy and shot him, leading to Reed's suspension. Malloy and his by-the-book replacement partner locate the green Beetle (now yellow) after going through numerous DMV checks and locate the other man, exonerating Reed.

Reed is suffering from a wrist injury which puts him on desk duty, while Malloy has to break in a new rookie partner. Reed's day is far from routine as he has to handle a bomb threat that results in the evacuation of the station, Officer Brinkman accidentally discharges his shotgun twice, a young man wants to report misconduct by a police officer, an elderly man brings a shotgun into the station to drop off, Malloy brings in a group of children abandoned by their mother, and Malloy and his partner pursue a car into the police parking lot, where the suspects are arrested.

Officer Charlie Burnside pulls a prank on Officer Albert Porter, a friend of Reed's. Porter, who does not find the prank funny, informs Reed that Burnside is frequently "badge-heavy" (rough) with his suspects. After dealing with an inept would-be robber, Malloy and Reed observe Burnside choking a suspect. Reed reports the incident, but nothing is done by the Captain because the victim would not admit Burnside was the aggressor. Burnside turns cocky on Reed saying he has "an ace in the hole" and that Reed was mad about the prank he pulled on Porter, but it is later revealed that Burnside got to one of the robbers, placing him under investigation. At the end of watch, Burnside tries intimidating Reed, then tries brushing his intimidation off as a joke when he realizes the other officers are against him; when they all walk out, Burnside resigns.

Malloy and Reed are given an older cruiser with 300 miles to go until retirement. They quickly learn the car is extremely unreliable and barely works: the accelerator surges, the glove compartment door constantly drops on Reed's knees, the water hose breaks while they are sneaking up on a prowler suspect (actually just a man who once lived there), their malfunctioning taillights prevent them from writing a ticket to a citizen whose car had the same problem, the distributor cap fails when trying to respond to another call, and finally, after capturing a pursuit suspect, the car's brakes fail and the unmanned car totals itself on a light pole. Another call regarding a truck loading up at a warehouse leads to the arrest of a large group of organized burglars after Malloy notices a slight discrepancy in their otherwise foolproof plan.

Malloy and Reed begin today's patrol by responding to a call of a drunken woman threatening the patrons of a bar with a handgun. Afterwards, they search for a group of four carjackers who go on a robbery spree after targeting a man with a cache of guns in his trunk, and investigate the suspicious death of a mentally disabled man.

A "child-left-alone" call turns up a horrifying case of child neglect. A 6-year-old girl is left home with her baby brother and both parents are unable to provide for their children.

Malloy's old landlady, Mrs. O'Brien, has her purse stolen and refuses to leave the station until her case is settled. Mrs. O'Brien resorts to other means, including hounding detectives and setting up a picket line to vent her frustrations. Malloy makes connection between her theft and a string of purse snatchings involving social security checks, and a decoy leads to the end of the theft ring. Calls include two suspicious men and a pursuit involving them, and a homicide where candy wrappers and tire tracks from the pursuit suspects are found.

While on second shift, Malloy and Reed take Police Commissioner Dixon on a ride-along. They encounter a bar owner who locked a naked, elderly man inside, a fight with a knife-wielding man and another man with a gun, and a missing 17-year-old deaf boy with mental instabilities, which Reed recognizes as the boy that escaped his foot pursuit in the previous episode.

Malloy and Reed are stunned to discover that the driver who led them on a high-speed chase is the son of Sgt. MacDonald, and Malloy takes it upon himself to help his boss figure out why the young man is acting out. In the meantime, they investigate a possible burglary in progress at an apartment building, mediate a dispute at a park over an elderly woman feeding ducks, respond to a call of two armed men fighting over a woman and deal with a wino who is attempting to direct traffic at a busy intersection.

Reed returns from an off-day with an uncomfortable full-body sunburn, which causes him problems throughout the watch. Calls include responding to a traffic accident, acting on a tip from an informant, busting a drug dealer working out of abandoned homes, searching for a robbery suspect based on a vehicle description, and assisting in the rescue of two boys when their boat capsizes.

Reed and Malloy report to a burglary call that was witnessed by a boy with a photographic memory. Afterward, they are called to the scene of two drunk men shooting at a box of dynamite at close range in a residential area.

It's Christmas Eve in Los Angeles, and Malloy and Reed track down a suspect who beat and mugged a rescue mission Santa, who later gets arrested himself. They also respond to an alcohol-related traffic accident that resulted in a fatality, help a penniless widow who has been detained for shoplifting and take part in the search for a young Native American child who wandered off into a mountainous area while her parents were asleep.

Reed and Malloy have a gun pulled on them after stopping a car that turns out to be stolen, but the contents of the trunk link the two suspects to an even more sinister crime. Afterward, a recently widowed father and his teenage daughter report that their home has just been toilet papered, which ends up being a prelude for a much more serious incident.

Malloy and Reed are on patrol, and find a homeless man stabbed. They take a retired policeman, Jack Donohoe (who lives nearby), in for questioning, but he is released when the real suspect is found. Donohoe later gets involved in a shootout with a robbery suspect. Other incidents include an aspiring actress from Missouri shooting up a phone booth at Union Station after being lured by a theatrical agent who promised a movie career and took her money, and then having her suitcase, containing a rattlesnake, stolen at the station.

After beginning the search for a well known suspect who just stole a 600-pound offset printing press, Reed and Malloy try to convince an 85-year-old man to leave the soon-to-be demolished apartment building where he's resided alone for 27 years. Afterward, they pull over a very unusual vehicle, and chase a delivery truck to the end of an unfinished bridge.

The officers undergo their driver refresher courses to hone their pursuit and driving skills. A rash of car strippers brings about a new approach suggested by Officer Wells: going undercover as paperboys riding bicycles to find the thieves. Hilarity ensues; Wells wrecks his bicycle that belonged to a young girl, Malloy deals with an irate newspaper customer, and Reed and Malloy pull over a VW Microbus on a traffic violation where the driver's parrot chanted "Down with Pigs!", but the tactics work and the officers break up the car stripping ring.

A World War II survivor and tailor shop owner sets an ambush for an unidentified intruder when Malloy and Reed intervene. R&I determines the owner is clean and emigrated to the U.S. seventeen years earlier from Eastern Europe. The officers speak with a local priest who knows the owner, who complains to Sgt. MacDonald about what he feels is the officers' interference. Later, shots are fired at the shop, and the officers find a wounded intruder with no one else in the shop. Malloy and Reed find the owner with the priest, who informs them that the intruder is a former Nazi soldier who killed his relative during the war.

Malloy and Reed pull over a car on a routine traffic stop and are taken hostage by two robbers escaping from their heist. The officers have to use all their skills to escape the situation.

Reed loses a case against a young car thief in juvenile court, who later dies in high-speed pursuit. A girl's boyfriend dies from a heroin "hot shot", she buys drugs from the supplier and provides the serial number of the $10 bill she used to buy them. An elderly woman insists on being arrested rather than ticketed for a traffic violation.

Malloy returns from vacation sporting a mustache, prompting chuckles and guffaws from the squad. The officers then assist Air Ten in rescuing two people from an airplane crash. Reno West, a paroled thief, is suspected in the theft of some stamps from a mansion. A witness provides excellent descriptions of suspects involved in a jewelry store robbery. And a woman takes an alleged purse snatcher to the police station in her car rather than walk four miles to do so. Malloy shaves off the mustache when he has trouble trimming it.