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Unaware she has contagious meningitis, a singer who witnessed a mob murder flees the hospital.

Linc is convinced that the death of his friend, Tommy Salido, a stunt-driver was not accidental. The trio investigates and uncover a drug smuggling operation.

Pete and Linc successfully infiltrate a gang of thieves only to discover they are protected by crooked cops and that Julie has become an unwitting hostage.

Pete and Linc infiltrate the operation of a shipping magnate who is stockpiling weapons to equip his private army.

Julie poses as an unwed mother to infiltrate an extortion racket that blackmails parents of adopted babies.

A murderer stalks the suspended priest who heard his confession.

Linc and Pete go undercover as prison inmates to protect the life of a convicted draft dodger, whose father is a General in the Vietnam War.

A clairvoyant's prediction about a missing college student leads to an illegal abortion ring.

During a campus demonstration a student protester is found dead. The protesters think he was killed by the police and the police think he was killed by another student.

Pete's fraternity brother is framed for murder.

Beau Graves is released from prison after the trio put him there two years ago. Pete is trying to decide whether or not to quit the trio and work for his dad. Flashbacks to previous episodes after Linc is shot make it clear to everyone the importance of their ""family"".

Pete's concern for a former girlfriend's problems involves him in her family's corporate power struggle---and a reunion with his mother. Claire: Margot Kidder. Doug: Mark Goddard. Pete: Michael Cole. Linc: Clarence Williams III. Julie: Peggy Lipton. Greer: Tige Andrews.

After he tries to stop a runaway car, the son of a former cop and friend of Captain Greer is charged with stealing the vehicle. Then it is learned that the car, which belonged to a judicial candidate's campaign worker, was also involved in a hit-and-run. The trio goes undercover at the candidate's headquarters to further investigate.

Linc receives a desperate call from an old friend, now an inmate at a mental institution. Shortly afterward, the friend is dead of "heart failure", only the latest of a number of strange deaths at the place.

Sammy Davis Jr. plays brash film star Willie Rush, who's feigning indifference to threats on his life. Pete: Michael Cole. Marci Weaver: Lola Falana. Linc: Clarence Williams III. Julie: Peggy Lipton. Cal Rush: Lawrence Cook.

Jack Cassidy as the mastermind of an unusual business: his clients pay him to harass people and he employs a gang of youths to do the dirty work. Pete: Michael Cole. Mrs. Hamilton: Barbara Rush. Linc: Clarence Williams III. Johnny: Richard Kim Milford. Julie: Peggy Lipton.

Julie goes under cover to probe the death of a girl trying to unmask a narcotics czar. Julie: Peggy Lipton. Ray Abruzzi: Michael Ansara. Greer: Tige Andrews. J.B.: Ray Walston. Schwartz: Ron Soble.