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36 Episodes 1960 - 1961
Episode 1
Sat, Sep 17, 196060 mins
Beatrice Martin Kipp, a rather domineering wealthy widow, hires Checkmate to find out who it is who has made an attempt on her life. She insists Don Corey accompany her to her extensive ranch to investigate, and is far from pleased when Don, due to other commitments, must send young Jed in his place. However, with Dr. Hyatt's help, Jed unravels the mysterious murder plot despite their client's lack of faith in his experience.
Episode 2
Sat, Sep 24, 196060 mins
A desperate criminal, intending to flee the country, kidnaps a newly-wed bridegroom and takes his place, but not before the bride calls in Checkmate for help.
Episode 3
Sat, Oct 1, 196060 mins
Dean Stockwell guest stars as a college student out to avenge the death of his fraternity brother who was killed by a car thief.

Episode 4
Sat, Oct 15, 196060 mins
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.

Episode 5
Sat, Oct 22, 196060 mins
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.
Episode 6
Sat, Oct 29, 196060 mins
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.

Episode 7
Sat, Nov 5, 196060 mins
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.
Episode 8
Sat, Nov 12, 196060 mins
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.

Episode 9
Sat, Nov 19, 196060 mins
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.
Episode 10
Sat, Nov 26, 196060 mins
While on vacation in Tijuana, Don and Jed become involved in a murder investigation when Jed becomes the principal suspect.

Episode 11
Sat, Dec 3, 196060 mins
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.

Episode 12
Sat, Dec 17, 196060 mins
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.

Episode 13
Sat, Dec 31, 196060 mins
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.

Episode 14
Sat, Jan 7, 196160 mins
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.

Episode 15
Sat, Jan 14, 196160 mins
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.
Episode 16
Sat, Jan 21, 196160 mins
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.
Episode 17
Sat, Jan 28, 196160 mins
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.
Episode 18
Sat, Feb 4, 196160 mins
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 Marsdon, doubling the danger for him.

Episode 19
Sat, Feb 11, 196160 mins
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 appointed meeting in time to save Jed and Dr. Hyatt.
Episode 20
Sat, Feb 18, 196160 mins
A prisoner, played by Gary Merrill, is paroled after serving 20 years for a robbery and a gunshot victim. The son of the victim vows to make him pay once he comes back into the community. Others are also out to silence Merrill.

Episode 21
Sat, Feb 25, 196160 mins
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.
Episode 22
Sat, Mar 4, 196160 mins
A woman believes her husband has killed her male friend, who can not be found. She hires Checkmate to investigate.
Episode 23
Sat, Mar 11, 196160 mins
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.
Episode 24
Sat, Mar 18, 196160 mins
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.
Episode 25
Sat, Mar 25, 196160 mins
A successful cartoonist, played by Mickey Rooney, becomes tormented when he believes his star cartoon character, O'Hara, is alive and trying to kill him.
Episode 26
Sat, Apr 1, 196160 mins
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.
Episode 27
Sat, Apr 8, 196160 mins
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.
Episode 28
Sat, Apr 15, 196160 mins
Julie London plays a magazine editor, who is dealing with her hot headed husband just released from prison, and her publisher and partner, (Simon Oakland).When Oakland receives a threatening letter, London's husband is the main suspect.
Episode 29
Sat, Apr 22, 196160 mins
Cyd Charisse plays a Prima ballerina, who is threatened by a lover. Checkmate get a retired cop to keep an eye on her, but he ends up dead, and later her lover is also murdered.
Episode 30
Sat, May 6, 196160 mins
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,
Episode 31
Sat, May 13, 196160 mins
Checkmate are called in to investigate a military Academy for the suspected murder of the gym instructor .

Episode 32
Sat, May 20, 196160 mins
Eve Arden, plays a fashion designer, worried that someone is out to destroy her and her business. Checkmate have two main suspects.

Episode 33
Sat, May 27, 196160 mins
Susan Oliver plays a independent thrill seeking woman, who is accused by her husband's mother that she was responsible for his death from a parachute jump. The mother in law vows she will die, as a result.

Episode 34
Sat, Jun 10, 196160 mins
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.

Episode 35
Sat, Jun 17, 196160 mins
Keenan Wynn plays a retired rich contractor, a rough diamond who craves social acceptance, but seems to create many enemies . Someone is out to kill him, with many suspects.

Episode 36
Sat, Jun 24, 196160 mins
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.