Checkmate - Season 1 (1960)

A witness set to testify in a murder trial seeks the help of Checkmate fearing someone is attempting to discredit her testimony by making it appear that she is mentally unstable.

A well respected archaeologist is about to murder a mysterious man, supposedly dead for many years. The doctor's fiancée hires the Checkmate team to stop the murder.

A girl shows up at Corey's apartment, claiming that she is running from someone who is trying to kill her. However, the detectives all find that nothing she has said checks out, including her numerous aliases, and that she's actually an heiress running from a controlling grandmother. But it does appear that the part about someone trying to kill her may be the truth.

A woman hired Checkmate to prevent the murder of her father, an oil magnate. He suspects his assailant is an ex-partner and wants a private showdown with his nemesis.

A young widow is attacked and the only photograph of her dead husband, a Marine private is stolen. Checkmate investigates to thwart a conspiracy against her and the private the military claims never existed.

Barbara Rush plays a dual role as the inhibited Margaret Russell and the wild, heartless Nikki Garnett who feels no remorse for robbing a casino that results in the death of an accomplice. Checkmate is hired to prevent Nikki from destroying Margaret.

While on vacation in Tijuana, Don and Jed become involved in a murder investigation when Jed becomes the principal suspect.

Checkmate is hired to protect an Ambassador's daughter receiving death threats from the Asian community after killing a Chinese child with her car. She has a history of speeding and is not being charged because of diplomatic immunity.

The detectives are shocked when one of their mentors, a highly respected attorney and legal scholar now terminally ill, summons them to his home, along with six other people whom he once successfully defended in murder trials. He announces that one of the six was actually guilty of the crime, though he doesn't say which one, and that he intends to make that person pay now for their crime.

Corry and Sills's cleaning woman is killed in a fall just after warning Sills of a plot to kill a "princess"---a young woman who is planning a major renovation of some properties she owns.

A missionary arrives from the east and contacts Checkmate to warn them about a plot to kill Tom Lin, a Chinese patriot currently in hiding in San Francisco; he has apparently been shot in the arm while trying to find Lin and warn him of the danger he is in. It soon turns out, however, that the missionary is actually an assassin sent to kill the daughter of Win Lee, a former Chinese warlord also residing in San Francisco.

Alonzo Pace Graham, freed from prison after 15 years, seeks revenge on Dr. Carl Hyatt. Graham devises an elaborate plot intended not only to kill Hyatt but ruin his reputation as well. Hyatt is implicated in a murder - a murder that never occurred.

When a judge and friend of Dr. Hyatt receives telephone calls and letters threatening his life if a man he sent to death row is e executed, Checkmate investigates the guilty man and the judge's character.

Checkmate has more than one mystery to solve when they are hired by an unknown client to protect an unknown victim from an unknown killer at Felicia Royden's remote estate. Jed and Dr. Hyatt, posing as servants for the family, are puzzled by Mrs. Royden's strange little girl, Carol, who apparently makes up wild stories for no reason, but they soon begin to think Carol may hold the key to the mystery.

The Checkmate boys have their hands full in protecting their client Danny Whitman from racketeer Frank Marsdon when Danny starts a one-man crusade against the crime king-pin and his wife. Marsdon's drunken wife, Corinne, killed two people in a car accident, and Danny, determined not to see justice thwarted by Marsdon's threats and bribes, continues to publicize the accident and subsequent trial on his television show, gaining for him the animosity of Frank Marsdon. What Checkmate doesn't know is that Danny has now become a pawn in another person's scheme against ...

The Checkmate team has big trouble when Joe Farrell and his gang of hoods take them hostage at gunpoint. Farrell wants Don Corey to bring his estranged wife Jean and some stolen money he hid in her apartment to a boat where he intends skipping the country. If Don fails, both Jed and Dr. Hyatt, held hostage in their separate homes, will be killed. Farrell can't go for Jean himself, as rival gangsters are out after him; to complicate things even more, Farrell has a traitor in his gang trying to intercept Don and Jean who are desperately trying to bring the money to the ...

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Checkmate is hired by a pop singer's agent to investigate death threats. Jed goes undercover as an aide to the performer and travels with him to Hollywood where the threats escalate to gun shots.

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Lola Tuscany, a temperamental lady soprano, is having premonitions of her death. After her concert she is almost poisoned and Checkmate Inc. is hired to keep her safe. Don Corey is skeptical, believing it is a publicity stunt, until he is nearly killed when a bomb explodes in the car he and Lola are driving in.

Audrey Meadows stars as a writer of a scandalous, best-selling novel based on an unsolved twenty-year old murder in her small town. She is writing a sequel that reveals the killer and hires Checkmate for protection when attempts are made to silence her.

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After two attempts on his life, big game hunter Lee Tabor brings Dr. Hyatt and Carl to his home in the Malayan jungle. He asks for their help in finding out which of his three house guests is trying to kill him.

Gangsters chase a deaf schoolteacher who has read their lips and so learned of their plan to bring fellow mobster Antonio Lucas into the country from Cuba.

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Joan Fontaine plays a woman who claims her husband is trying to kill her. Corey accompanied her on a cruise ship to protect her but her odd behavior raises doubts. Also onboard watching her closely is a private detective who claims to be hired by her husband,

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A Washed up Hollywood Movie Stuntman's life is being threatened by someone working on a movie he is in, Don from Checkmate steps in to try to figure out who is the one responsible for the threats & he also tries to stop him from actually murdering the stuntman who's life is hanging in the balance.

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A series of carefully planned "accidents" aimed at a wealthy heiress who is the wife of hospital's director is investigated by Checkmate. Don ends up as a patient after suffering an accident on the property.