After an assassination attempt on a Senator's life is foiled by S.W.A.T., a criminal mastermind enlists globetrotting assassin Bravo to finish the job. Hondo's unit may have met their match hunting down this human time bomb, as the elusive hit man unwittingly spreads a deadly plague around L.A.

Hondo and his team go after a gang of jewel thieves who make their getaways under water.

In order to nab a mysterious sniper who's been murdering a series of men a young model has been dating, Street poses as the beautiful woman's latest boyfriend to lure the sniper out of hiding.

Hondo and his team close in on the gang that has been committing robberies using SCUBA gear.

Mel Lang and Ralph Costa have served sentences in prison after being framed by one Carl Rigby and arrested by Hondo Harrelson. When S.W.A.T. is called upon to assist police in evicting heavily armed brothers Will and Johnny Brewer from a home taken over by Rigby, Lang and Costa plan to execute Hondo and Rigby and create evidence pointing to the Brewer Brothers.

Hondo and a convicted dope dealer are stranded in rough terrain when syndicate thugs who want to keep him from testifying sabotage their helicopter.

Following a training exercise with S.W.A.T. officers from another division, Hondo and Street find the dead body of officer Frank Crane with the words ""Kill S.W.A.T."" pinned to his chest. The murder of Crane is the forerunner of a series of attempts to wipe out S.W.A.T. by brothers Mike and Simon Bishop and their fanatic sister-in-law, Joanna, who is convinced that the death of her husband was the result of S.W.A.T. ""brutality.""

Howard Wilson is jailed and his partners, Mike Simon and Frank Peterson, escape before S.W.A.T. moves in to combat a race track heist involving a female hostage. Wilson is on the brink of revealing the names of his partners when a high-powered attorney, Jason Bridges, assures him that Simon and Peterson are planning to free him at all costs--even if the price involves the lives of court personnel when Wilson goes to trial.

Millionairess Doris Bristol has brought gems into the hospital where she is undergoing cosmetic surgery. Her bodyguard, John DeLeon, is slain after he spots criminal Frank Malloy posing as a dying patient (part of a plan where a woman doctor and he plot to steal the jewels from the socialite). Hondo and his men, who are at the hospital putting together a Christmas party in the children's ward, find themselves on duty when the discovery of DeLeon's body leaves Mrs. Bristol unprotected and in apparent jeopardy.

As Lt. Harrelson lies in a hospital bed, severely wounded, the other members of the team reminisce about their best moments together in clips from previous episodes.

A convicted murderer's Manson-style "family" engineers his prison escape, but after executing a D.A., this maniacal leader sends a cryptic message to Hondo, naming him as his next victim, along with the jury who found him guilty.

Radio repairman Paul Julian has patched in on the S.W.A.T. radio band so he can show up at a scene of police action, where he can observe and judge each case from a concealed position. when Julian decides to punish two disarmed gunmen who have been talked into surrendering by Lt. Hondo Harrelson, S.W.A.T. is suspected of causing the senseless killings.

D.A. Ainsely Stevens holds secret information which could convict two syndicate chieftains of capital crimes. Because Stevens insists on saying nothing until the grand jury convenes, and because police believe the mob has put out a ""major contract"" on Stevens, S.W.A.T. is assigned to guard him. But enforcer Mario Rosetti plans to abduct the prosecutor's daughter, Tory, and keep the girl until the father cracks. Oblivious to the danger, Tory is out for kicks as police and crooks try to track her down.

The SWAT team protects a key government witness against an organized crime boss.

Bud Haskins, disowned after marrying a girl whom his father, John Haskins, disapproved, decides to help three ""professionals"" crack open the safe in the elder Haskins' warehouse. Bud is unaware that the thieves are actually after a huge arsenal of sophisticated, unmarked weapons that have been secretly imported for sale. Bud is slain after helping the criminals burglarize the warehouse. Although S.W.A.T. is assigned to investigate the burglary-murder, John Haskins recruits members of a tough Eastern mob to find the killers of his son.

After a convicted felon agrees to expose a crime syndicate's dirty laundry before a Senate committee, he learns that a Mafia "hit" has been placed on his life, and he is wounded in an ambush en route from the penitentiary.

A fanatical terrorist group poses as a documentary crew in a scheme to hold a professional basketball team hostage during its championship game, demanding a multi-million dollar ransom for their cause.

Hondo and his team are assigned to handle security for a demagogic former general who now leads a racist paramilitary group.

A man steals a tugboat laden with explosives and threatens to blow up a famous marine biologist unless he is given a million dollars.

Hondo Harrelson and his team are called upon to investigate robbery-homicides in which powerful drills and cutting equipment have been stolen. Meanwhile, Dom Luca is dating a student, Sharon Merlingdale, who is being carefully watched by Mark Worth, one of the killer thieves. The more Sharon sees Dom Luca, the more convinced North becomes that the girl must be eliminated.

Clues to the perpetrators of a series of rapes are a religious medal and a Biblical quotation overheard by one of the victims.

A mentally unbalanced veteran touring a movie studio suddenly thinks he is back fighting in Vietnam.

When a veteran police officer who served with Hondo in Vietnam lobbies to fill in for ailing "Deacon" Kay, Hondo thinks he's the right man for the job - until urban combat dredges up jungle-warfare memories for the embattled vet, triggering a nervous breakdown that risks jeopardizing the entire team.

Lt. Eddie Chew is assigned to aid Lt. Hondo Harrelson when an elderly shop owner is fatally beaten by an illegal Chinese alien working as a shakedown man for Albert Parker, the Caucasian leader of what appears to be an all-Oriental crime syndicate, a deadly drug and protection ring. Hondo begins to doubt Chew's integrity when it becomes obvious that Chinatown criminals are being given secrets of his investigation.

Street's partner, officer Rob Duran, is killed in the premeditated police assassination by two brothers bent on revenging their father's death. That and subsequent police killings serve to shape the psychology of Lt. Dan ""Hondo"" Harrelson's newly formed Special Weapons and Tactics team, ""S.W.A.T."" The team's task is to combat high risk, contemporary, urban crime as a strike force. The team consists of James Street, David ""Deacon"" Kay, T.J.. McCabe, Dominic Luca, and Harrelson. ""S.W.A.T.""'s first assignment is an acid test of their ability to survive as individuals and as a team. Their rigorous training is literally a fight against time.