The D.A.'s Man - Season 1 (1959)

A bakery owner is a lone holdout against protection racket mobsters. Shannon infiltrates the racket with the hope of busting them before the baker gets done in.

Shannon poses as an insurance agent in an effort to persuade a produce company owner to testify against the mob,

Shannon poses as a dope fiend in order to bust a heroin ring which has taken over a young woman's cafe.

Shannon goes undercover in the Bowery to prove a bar owner is poisoning homeless men with wood alcohol.

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A young boy witnesses his mobster godfather making a hit. Is the godson untouchable, or will the godfather murder his own godson if push comes to shove?

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Shannon poses as a country bumpkin to go after some big-city moonshiners.

When a wealthy man is beaten and robbed, Shannon and Bonacorsi are given one clue by the victim: one of the men looked like an Indian and was called "Chief" by the other assailant.

Three killers are being held by the D.A. but he will have to release them unless he can get more evidence. Shannon fingers one of the men as the probable weakest link and goes undercover as his cellmate.

Pretty blonde hangs out at the library and lures lonely men back to her apartment where they are drugged and extorted by her two cohorts. Shannon will try to nab the trio by allowing himself to be lured to the blonde's apartment.

Little boy named Corky is kidnapped coming out of the theater by two slightly older children. When Shannon learns that the bus driver who picked up the kids has been found dead, he realizes that Corky is in extreme danger.

Shannon goes undercover as a Club Fighter to bust a crooked fight operator.

Shannon seduces an old gangster's much younger moll.

A numbers boss conceals his operation from his son to make the son believe he has come clean. Shannon uses this dynamic between crooked father and respectable son to flush out the crooked father.

Shannon goes after a pair of swindling gypsies.

To catch a pimp, Shannon poses as a john.

Shannon tries to convince a heroine-addicted actress to give up the name of her dealer.

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Shannon poses as a candy salesman in a small upstate town to investigate the murder of a local farmer.

Shannon infiltrates a garment fence.

Shannon must figure out which one of 3 brunettes on a flight from New York is carrying stolen loot before the plane lands at Chicago Midway.