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The Open Web (09/17)
Rip Torn guest-stars as gang leader Victor Rorke, and former NYC detective Eddie Egan plays Lt. Paul Haber (Egan is the policeman whose exploits were the basis for "The French Connection"). Mannix and Lt. Malcolm are holding Rorke custody in the Santa Monica Mountains. When a helicopter with false sheriff markings swoops down, rescues Rorke and takes Malcolm hostage, Mannix calls for police help and Lt. Paul Haber arrives.

Cry Silence (09/24)
Before relinquishing his vows, Father Jim Conway hears the confession of a man who hired a killer to murder his girlfriend. Although the former priest insists he would never reveal what he heard in the confessional, attempts are made on his life. When Mannix is asked to find the assailant, he becomes the target of attacks as well.

The Crimson Halo (10/01)
Joseph Campanella guests as Dr. Graham Aspinall, whose devotion to medicine makes it a mystery when an attempt is made on his life. Attorney Noah Otway (guest star Burgess Meredith) asks Mannix to find out who wants to kill his client.

Broken Mirror (10/08)
A beautiful society woman disappears from her husband's yacht during their second honeymoon. Mannix is sent to the area in search of clues. While touring the waters in a small boat, he is pulled under by two frogmen who attempt to drown him.

Portrait of a Hero (10/15)
A former Air Force pilot is murdered just before showing an experimental airplane to the press. While investigating, Mannix learns that the company that built the plane was in financial trouble--until the plane started making flights to a mysterious location.

The Inside Man (10/22)
Mannix infiltrates a New Orleans gang to help police get evidence on its members, and becomes romantically involved with a female gang member. When the mob leader is informed that there is a traitor in his midst, he takes steps to learn his name.

To Kill a Memory (10/29)
Martin Sheen guest-stars as Alex Lachlan, a soldier believed killed in Vietnam who suddenly returns home with amnesia and carrying a forged passport under a new name. Fearing Alex is in trouble, his family asks Mannix to investigate. Mannix discovers that Alex is involved with diamond thieves and that his return means disaster for a member of his family.

The Upside Down Penny (11/05)
When Mannix agrees to help 12-year-old Kenny Brooks find his lost stamp collection, he stumbles onto a half million dollar swindle. Kenny says he lost his stamps near the Long Beach Pier and offers Mannix $1.85 to find them. The trail leads to an alcoholic artist who disappears after telling his friends he inherited money.

One Step to Midnight (11/12)
Enemies of deported gang lord Bruno Raffael believe he has returned to the country and are trying to track him down. When murder attempts are made on some of Raffael's family, they ask Mannix for protection. Mannix tries to find the assailants, but they seem to know his moves almost before Mannix does.

Harvest of Death (11/19)
Mannix is asked to investigate the disappearance of two crop-dusting pilots whose employer, Clint Carpenter, believes a rival is trying to sabotage his orange crop. Hoping to find clues, Mannix poses as a crop duster. Later, when a murder is committed, Mannix is arrested as a suspect.

A Puzzle for One (11/26)
Adam West guest-stars as suave businessman Jonathan Forsythe. The slaying of a private-detective friend sends Mannix on a dangerous search for the killer. While checking the cases under investigation by the slain man, Mannix foils a murder attempt on Forsythe and meets the vengeful Wojeska, father of a drug victim. Mannix provides a hideout for Forsythe and sets himself up as target for the would-be killer.

Lost Sunday (12/03)
A plant foreman is shot, but official records are changed to make it appear as an accident; the victim's sister doesn't believe it was an accident and asks Mannix to investigate. Mannix finds that the killer was the sister's fiancee; while gathering clues, Mannix is arrested on a phony charge.

See No Evil (12/10)
Investigating a murder, Mannix finds evidence pointing to Peggy's friend Glenn Gerard. Peggy insists that one-time juvenile delinquent Gerard has reformed, but when Mannix tries to question him, he flees. Later, when Gerard's girlfriend offers to take Mannix to another suspect, she leads him into an ambush.

Light and Shadow (12/17)
Alison Bramante, wife of one of the richest men in the world, is accused of murdering one of her stepdaughter's admirers. Mannix is hired to prove her innocence. While pursuing leads, Mannix is roughed up by two thugs and concludes he is on the right track.

A Game of Shadows (12/24)
A wealthy businessman arrives home to find his wife dead, his best friend running from the scene and a fortune in jewels missing. Convinced that the man is innocent, his girlfriend persuades Mannix to find him. Digging into the case, Mannix is surprised to learn that all government and private records of the man have disappeared.

The Man Who Wasn't There (01/07)
Mannix is marked for death by an enemy who chooses to taunt him before carrying out his threat. When Mannix finally learns the identity of his tormentor and prepares to apprehend him, the man kidnaps Peggy and threatens to kill her unless Mannix walks into his trap.

A Matter of Principle (01/14)
When Elmo Bagley planned a perfect murder, he didn't count on the righteous indignation of two elderly sisters. As Bagley drove away from the scene of his crime, he backed into an ancient limo belonging to Portia and Penelope Penhaven. The sisters hire Mannix to bring the driver to justice, at any cost.

Out of the Night (01/21)
Peggy Fair agrees to be arrested on false charges of prostitution to help police break a narcotics ring. Dodie Green is arrested for selling dope to school children; Peggy goes to jail and plays her part so well that Green invites her to join the ring. Just as Peggy begins to gather evidence, the gang decides to check up on her.

Carol Lockwood, Past Tense (01/28)
The body of Carol Lockwood is washed up on the beach, and Mannix learns that she was aboard business tycoon Dana Royal's yacht when it blew up. Royal was rescued three days later when Leona Kellaway, an expert pilot posing as a student pilot, spotted him clinging to a piece of wreckage.

The Faces of Murder (02/04)
Lucas Hume freely admits to police that he has just shot a man he believes framed him on a bribery charge. His sister Christina tries to convince police that she was the murderer. When they refuse to believe her, she asks Mannix to find the evidence that will convict her.

Search for a Whisper (02/18)
Mannix gets his strangest assignment when a business tycoon wants himself investigated, even if it ruins his reputation. Adam Langer wants to run for governor and has Mannix find anything that political enemies may use against him. Mannix accepts, but when he finds too much, someone tries to silence him.

To Quote a Dead Man (02/25)
A harmless hobo mysteriously becomes a target for assassination whenever he wears his colorful patchwork coat. Mannix is skeptical when the hobo tells him that bullets are being fired at him for no reason. Mannix changes his mind when a rifle shot just misses the hobo while Mannix is talking to him.

A Problem of Innocence (03/04)
William Avery served 10 years on charges of stealing a $1 million payroll which still has not been recovered at the time of his parole. The day he is released, Avery's car crashes over a cliff and his daughter Anne's apartment is ransacked. Anne asks Mannix to investigate, but after three more deaths, police point the finger at her.

The Danford File (03/11)
A politician's career is endangered when a blackmailer threatens to expose his wife's unsavory past. Mannix agrees to make the payoff but is slugged and robbed. His problem increases when police tell him that the supposed blackmailer has been dead for five years.

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